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User:Georgi Guninski/seqs/relations1

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Relations

Some relations in a single sequence found by `stefun'. `ext link' is external link


A000023 ext link 4*a(n - 2)*a(n - 1) - 2*a(n - 2)*a(n + 1) + 4*a(n - 1)^2 - a(n - 1)*a(n + 1) + 3*a(n - 1)*a(n) + a(n)^2

A000023 ext link A000030 ext link a(n - 2)*a(n + 1) - a(n - 2)*a(n) - 2*a(n - 1)*a(n + 1) + 2*a(n - 1)*a(n) + a(n + 1)*a(n) - a(n)^2

A000030 ext link A000069 ext link -1/11*a(n - 2)^2 + 1/11*a(n - 2)*a(n - 1) + 1/11*a(n - 2)*a(n) - 1/11*a(n - 1)^2 + 1/11*a(n - 1)*a(n) - 1/11*a(n)^2 - 6/11*a(n - 2) + 6/11*a(n) - 1

A000069 ext link A000069 ext link -1/11*a(n - 1)^2 + 1/11*a(n - 1)*a(n + 1) + 1/11*a(n - 1)*a(n) - 1/11*a(n + 1)^2 + 1/11*a(n + 1)*a(n) - 1/11*a(n)^2 - 6/11*a(n - 1) + 6/11*a(n + 1) - 1

A000069 ext link A000085 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + a(n - 2)*a(n) - a(n - 1)^2 + a(n - 1)*a(n)

A000085 ext link A000108 ext link 10*a(n - 1)*a(n + 1) - 16*a(n - 1)*a(n) - a(n + 1)*a(n) - 2*a(n)^2

A000108 ext link A000108 ext link 112*a(n - 2)*a(n + 1) - 256*a(n - 2)*a(n) - 6*a(n - 1)*a(n + 1) - a(n + 1)*a(n) - 2*a(n)^2

A000108 ext link A000108 ext link 2048/3*a(n - 2)*a(n - 1) - 560/3*a(n - 2)*a(n + 1) + 256/3*a(n - 1)^2 + 110/3*a(n - 1)*a(n + 1) - a(n + 1)*a(n) - 2*a(n)^2

A000108 ext link A000120 ext link -a(n - 2)*a(n - 1) + a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n) - a(n - 2) + a(n) - 1

A000120 ext link A000120 ext link a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2 - a(n - 1) + a(n + 1) - 1

A000120 ext link A000123 ext link -a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) + 2*a(n - 1)^2 + 2*a(n - 1)*a(n + 1) - 5*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2

A000123 ext link A000142 ext link -a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n)^2

A000142 ext link A000142 ext link a(n - 2)*a(n + 1) - 2*a(n - 2)*a(n) - a(n - 1)*a(n + 1) + a(n)^2

A000142 ext link A000142 ext link -2*a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) - 2*a(n - 1)^2 - a(n - 1)*a(n + 1) + a(n)^2

A000142 ext link A000166 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n + 1) + 2*a(n - 1)*a(n) + a(n)^2

A000166 ext link A000245 ext link -16*a(n - 2)*a(n - 1) - 18*a(n - 2)*a(n + 1) + 58*a(n - 2)*a(n) - 18*a(n - 1)^2 + 13*a(n - 1)*a(n + 1) - 15*a(n - 1)*a(n) - a(n + 1)*a(n) - 3*a(n)^2

A000245 ext link A000246 ext link -a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) + a(n - 1)*a(n)

A000246 ext link A000255 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) - a(n - 1)*a(n + 1) + 2*a(n - 1)*a(n) + a(n)^2

A000255 ext link A000265 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) - a(n - 1)*a(n) + a(n + 1)*a(n) + 2*a(n - 2) + 2*a(n - 1) - 2*a(n + 1) - 2*a(n) + 4

A000265 ext link A000378 ext link -a(n - 2)*a(n - 1) + a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n) - a(n - 2) + a(n) - 1

A000378 ext link A000378 ext link a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2 - a(n - 1) + a(n + 1) - 1

A000378 ext link A000389 ext link -4*a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + 6*a(n)^2

A000389 ext link A000389 ext link -3/7*a(n - 2)*a(n + 1) - 2/7*a(n - 2)*a(n) - 30/7*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 6*a(n)^2

A000389 ext link A000389 ext link 1/15*a(n - 2)*a(n - 1) - 2/5*a(n - 2)*a(n + 1) - 2/5*a(n - 1)^2 - 64/15*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 6*a(n)^2

A000389 ext link A000522 ext link -a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) + a(n - 1)*a(n) + a(n - 2) - a(n)

A000522 ext link A000522 ext link -a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n)^2 + a(n - 1) - a(n)

A000522 ext link A000522 ext link a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) - 3*a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n + 1) + a(n)^2

A000522 ext link A000538 ext link -847/386*a(n - 2)*a(n + 1) - 23/386*a(n - 2)*a(n) - 45/193*a(n - 1)^2 - 4065/386*a(n - 1)*a(n + 1) - 525/386*a(n - 1)*a(n) + 235/386*a(n + 1)^2 - 1034/193*a(n + 1)*a(n) + 7383/386*a(n)^2 - 14/193*a(n - 2) - 362/193*a(n + 1) - 13724/193*a(n) - 1

A000538 ext link A000538 ext link 1/172*a(n - 2)^2 - 261/86*a(n - 2)*a(n + 1) + 25/43*a(n - 2)*a(n) - 117/172*a(n - 1)^2 - 663/43*a(n - 1)*a(n + 1) - 267/86*a(n - 1)*a(n) + 161/172*a(n + 1)^2 - 352/43*a(n + 1)*a(n) + 4971/172*a(n)^2 - 128/43*a(n + 1) - 4672/43*a(n) - 1

A000538 ext link A000538 ext link -175/54*a(n - 2)*a(n + 1) + 25/54*a(n - 2)*a(n) - 5/9*a(n - 1)^2 - 307/18*a(n - 1)*a(n + 1) - 7/2*a(n - 1)*a(n) + 55/54*a(n + 1)^2 - 242/27*a(n + 1)*a(n) + 191/6*a(n)^2 - 14/9*a(n - 1) - 88/27*a(n + 1) - 3170/27*a(n) - 1

A000538 ext link A000539 ext link 11/64*a(n - 2)*a(n - 1) + 23/32*a(n - 2)*a(n + 1) + 123/64*a(n - 2)*a(n) - 107/64*a(n - 1)^2 + 123/64*a(n - 1)*a(n + 1) - 25/16*a(n - 1)*a(n) + 11/64*a(n + 1)*a(n) - 107/64*a(n)^2 + 9/64*a(n - 2) - 489/64*a(n - 1) + 9/64*a(n + 1) - 489/64*a(n) - 1

A000539 ext link A000539 ext link 3/140*a(n - 2)^2 - 2/35*a(n - 2)*a(n - 1) + 67/70*a(n - 2)*a(n + 1) + 57/35*a(n - 2)*a(n) - 103/140*a(n - 1)^2 + 57/35*a(n - 1)*a(n + 1) - 187/70*a(n - 1)*a(n) + 3/140*a(n + 1)^2 - 2/35*a(n + 1)*a(n) - 103/140*a(n)^2 - 138/7*a(n - 1) - 138/7*a(n) - 1

A000539 ext link A000540 ext link -1/64*a(n - 2)^2 + 51/224*a(n - 2)*a(n - 1) - 143/224*a(n - 2)*a(n + 1) + 99/224*a(n - 2)*a(n) - 543/448*a(n - 1)^2 + 99/224*a(n - 1)*a(n + 1) + 393/224*a(n - 1)*a(n) - 1/64*a(n + 1)^2 + 51/224*a(n + 1)*a(n) - 543/448*a(n)^2 - 11/56*a(n - 2) - 2277/56*a(n - 1) + 11/56*a(n + 1) + 2277/56*a(n) - 1

A000540 ext link A000579 ext link -5*a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + 7*a(n)^2

A000579 ext link A000579 ext link -1/2*a(n - 2)*a(n + 1) - 1/4*a(n - 2)*a(n) - 21/4*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 7*a(n)^2

A000579 ext link A000579 ext link 1/21*a(n - 2)*a(n - 1) - 10/21*a(n - 2)*a(n + 1) - 1/3*a(n - 1)^2 - 110/21*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 7*a(n)^2

A000579 ext link A000580 ext link -6*a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + 8*a(n)^2

A000580 ext link A000580 ext link 4/13*a(n - 2)*a(n - 1) - 5/13*a(n - 2)*a(n + 1) + 22/13*a(n - 2)*a(n) - 32/13*a(n - 1)^2 - 80/13*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 8*a(n)^2

A000580 ext link A000581 ext link -9/2*a(n - 2)*a(n - 1) + 6*a(n - 2)*a(n + 1) - 59/2*a(n - 2)*a(n) + 81/2*a(n - 1)^2 - 5*a(n - 1)*a(n + 1) - 31/2*a(n - 1)*a(n) - a(n + 1)*a(n) + 9*a(n)^2

A000581 ext link A000582 ext link -5*a(n - 2)*a(n - 1) + 7*a(n - 2)*a(n + 1) - 38*a(n - 2)*a(n) + 50*a(n - 1)^2 - 6*a(n - 1)*a(n + 1) - 17*a(n - 1)*a(n) - a(n + 1)*a(n) + 10*a(n)^2

A000582 ext link A000695 ext link -a(n - 2)*a(n - 1) + a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n) - a(n - 2) + a(n) - 1

A000695 ext link A000695 ext link a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2 - a(n - 1) + a(n + 1) - 1

A000695 ext link A000788 ext link -a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) + 2*a(n - 1)^2 + 2*a(n - 1)*a(n + 1) - 5*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2 + a(n - 2) - a(n - 1) + a(n + 1) - a(n) - 1

A000788 ext link A000790 ext link -1/16*a(n - 2)*a(n) + 1/4*a(n - 2) + 1/4*a(n) - 1

A000790 ext link A000790 ext link -1/16*a(n - 1)*a(n + 1) + 1/4*a(n - 1) + 1/4*a(n + 1) - 1

A000790 ext link A000898 ext link 2*a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) - 2*a(n - 1)^2 + a(n - 1)*a(n)

A000898 ext link A000957 ext link -4*a(n - 2)*a(n - 1) + 5*a(n - 2)*a(n + 1) - 11/2*a(n - 2)*a(n) - 17/2*a(n - 1)^2 + 19/2*a(n - 1)*a(n + 1) - 53/4*a(n - 1)*a(n) - a(n + 1)*a(n) - 5/2*a(n)^2

A000957 ext link A000984 ext link 6*a(n - 1)*a(n + 1) - 16*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2

A000984 ext link A000984 ext link 80/3*a(n - 2)*a(n + 1) - 256/3*a(n - 2)*a(n) + 2/3*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A000984 ext link A000984 ext link -2048*a(n - 2)*a(n - 1) + 240*a(n - 2)*a(n + 1) + 256*a(n - 1)^2 - 42*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A000984 ext link A000999 ext link -a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n + 1)*a(n) - a(n)^2

A000999 ext link A000999 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n) - a(n - 1)^2 + a(n - 1)*a(n + 1) - a(n + 1)*a(n) + a(n)^2

A000999 ext link A001003 ext link -a(n - 2)*a(n - 1) - 4*a(n - 2)*a(n + 1) + 15*a(n - 2)*a(n) - 3*a(n - 1)^2 + 15*a(n - 1)*a(n + 1) - 34*a(n - 1)*a(n) - a(n + 1)*a(n) - 3*a(n)^2

A001003 ext link A001006 ext link -9*a(n - 2)*a(n - 1) + 12*a(n - 2)*a(n + 1) - 15*a(n - 2)*a(n) + 3*a(n - 1)^2 + 5*a(n - 1)*a(n + 1) - 10*a(n - 1)*a(n) - a(n + 1)*a(n) - a(n)^2

A001006 ext link A001040 ext link -a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n)^2

A001040 ext link A001053 ext link -a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n)^2

A001053 ext link A001097 ext link -1/4*a(n - 2)*a(n - 1) + 1/4*a(n - 2)*a(n) + 1/4*a(n - 1)^2 - 1/4*a(n - 1)*a(n) - 1/2*a(n - 2) + 1/2*a(n) - 1

A001097 ext link A001097 ext link 1/4*a(n - 1)*a(n + 1) - 1/4*a(n - 1)*a(n) - 1/4*a(n + 1)*a(n) + 1/4*a(n)^2 - 1/2*a(n - 1) + 1/2*a(n + 1) - 1

A001097 ext link A001120 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + a(n - 2)*a(n) + a(n - 1)^2 - a(n - 1)*a(n + 1) + 2*a(n - 1)*a(n) + a(n)^2

A001120 ext link A001193 ext link 2*a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 5*a(n - 2)*a(n) - a(n - 1)^2 - a(n - 1)*a(n + 1) + 3*a(n - 1)*a(n) + a(n)^2

A001193 ext link A001287 ext link -11/2*a(n - 2)*a(n - 1) + 8*a(n - 2)*a(n + 1) - 95/2*a(n - 2)*a(n) + 121/2*a(n - 1)^2 - 7*a(n - 1)*a(n + 1) - 37/2*a(n - 1)*a(n) - a(n + 1)*a(n) + 11*a(n)^2

A001287 ext link A001288 ext link -6*a(n - 2)*a(n - 1) + 9*a(n - 2)*a(n + 1) - 58*a(n - 2)*a(n) + 72*a(n - 1)^2 - 8*a(n - 1)*a(n + 1) - 20*a(n - 1)*a(n) - a(n + 1)*a(n) + 12*a(n)^2

A001288 ext link A001297 ext link 1053/82*a(n - 2)*a(n - 1) + 43*a(n - 2)*a(n + 1) + 9011/82*a(n - 2)*a(n) - 8775/82*a(n - 1)^2 + 42213/328*a(n - 1)*a(n + 1) - 22395/328*a(n - 1)*a(n) - a(n + 1)^2 + 6889/328*a(n + 1)*a(n) - 45639/328*a(n)^2 + a(n + 1) + 1398/41*a(n)

A001297 ext link A001297 ext link 3159/5287*a(n - 2)^2 + 246295/5287*a(n - 2)*a(n + 1) + 635839/10574*a(n - 2)*a(n) - 164619/5287*a(n - 1)^2 + 2696835/21148*a(n - 1)*a(n + 1) - 1870743/21148*a(n - 1)*a(n) - a(n + 1)^2 + 433681/21148*a(n + 1)*a(n) - 2849643/21148*a(n)^2 - 18954/5287*a(n - 2) - 170586/5287*a(n - 1) + a(n + 1) + 196377/5287*a(n)

A001297 ext link A001299 ext link -a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) + a(n - 1)^2 - a(n - 1)*a(n + 1)

A001299 ext link A001299 ext link a(n - 2)*a(n + 1) - a(n - 2)*a(n) - a(n + 1)*a(n) + a(n)^2

A001299 ext link A001299 ext link a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2

A001299 ext link A001300 ext link -a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) + a(n - 1)^2 - a(n - 1)*a(n + 1)

A001300 ext link A001300 ext link a(n - 2)*a(n + 1) - a(n - 2)*a(n) - a(n + 1)*a(n) + a(n)^2

A001300 ext link A001300 ext link a(n - 1)*a(n + 1) - a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2

A001300 ext link A001316 ext link -a(n - 1)*a(n + 1) + 2*a(n - 1)*a(n) + 1/2*a(n + 1)*a(n) - a(n)^2

A001316 ext link A001316 ext link 16*a(n - 2)*a(n - 1) - 8*a(n - 2)*a(n) - 8*a(n - 1)^2 + 2*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A001316 ext link A001317 ext link -a(n - 1)*a(n + 1) + 3*a(n - 1)*a(n) + 1/3*a(n + 1)*a(n) - a(n)^2

A001317 ext link A001317 ext link 81*a(n - 2)*a(n - 1) - 27*a(n - 2)*a(n) - 27*a(n - 1)^2 + 3*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 3*a(n)^2

A001317 ext link A001339 ext link a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) - 4*a(n - 2)*a(n) + 2*a(n - 1)^2 - a(n - 1)*a(n + 1) + a(n)^2

A001339 ext link A001399 ext link -a(n - 2)^2 + 2*a(n - 2)*a(n - 1) - 2*a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) - a(n - 1)^2 + 2*a(n - 1)*a(n + 1) - 2*a(n - 1)*a(n) - a(n + 1)^2 + 2*a(n + 1)*a(n) - a(n)^2 + a(n - 2) - a(n - 1) + a(n + 1) - a(n)

A001399 ext link A001405 ext link 2*a(n - 1)*a(n + 1) - 4*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2

A001405 ext link A001405 ext link 12*a(n - 2)*a(n + 1) - 16*a(n - 2)*a(n) - 2*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A001405 ext link A001405 ext link 32*a(n - 2)*a(n - 1) - 12*a(n - 2)*a(n + 1) - 16*a(n - 1)^2 + 6*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A001405 ext link A001476 ext link -a(n - 1)*a(n + 1) + a(n - 1)*a(n) + a(n + 1)*a(n) - a(n)^2 + a(n - 1) - a(n + 1) + 1

A001476 ext link A001476 ext link -1/2*a(n - 2)*a(n + 1) + 1/2*a(n - 2)*a(n) + 1/2*a(n + 1)*a(n) - 1/2*a(n)^2 + 1/2*a(n - 2) - a(n + 1) + 1/2*a(n) + 1

A001476 ext link A001476 ext link a(n - 2)*a(n - 1) + a(n - 2)*a(n + 1) - 2*a(n - 2)*a(n) - a(n - 1)^2 + a(n - 1)*a(n) - a(n + 1)*a(n) + a(n)^2 + 2*a(n + 1) - 2*a(n) - 1

A001476 ext link A001492 ext link a(n - 2)*a(n + 1) - a(n - 2) - a(n + 1) + 1

A001492 ext link A001492 ext link -a(n - 1)*a(n + 1) + a(n - 1) + a(n + 1) - 1

A001492 ext link A001492 ext link a(n + 1)*a(n) - a(n + 1) - a(n) + 1

A001492 ext link A001511 ext link -a(n - 2)*a(n + 1) + a(n - 2) + a(n + 1) - 1

A001511 ext link A001511 ext link a(n - 1)*a(n) - a(n + 1)*a(n) - a(n - 1) + a(n + 1)

A001511 ext link A001511 ext link a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) - a(n - 1)*a(n) + a(n + 1)*a(n)

A001511 ext link A001540 ext link -1/4*a(n - 2)*a(n - 1) + 1/4*a(n - 2)*a(n + 1) - 1/4*a(n - 2)*a(n) - 1/4*a(n - 1)^2 + 1/4*a(n - 1)*a(n + 1) - 1/2*a(n - 1)*a(n) - 1/4*a(n)^2 - 1/2*a(n - 2) - a(n - 1) + 1/2*a(n + 1) - a(n) - 1

A001540 ext link A001700 ext link 6*a(n - 1)*a(n + 1) - 16*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2

A001700 ext link A001700 ext link 80/3*a(n - 2)*a(n + 1) - 256/3*a(n - 2)*a(n) + 2/3*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A001700 ext link A001700 ext link -2048*a(n - 2)*a(n - 1) + 240*a(n - 2)*a(n + 1) + 256*a(n - 1)^2 - 42*a(n - 1)*a(n + 1) - a(n + 1)*a(n) + 2*a(n)^2

A001700 ext link A001768 ext link -a(n - 2)*a(n - 1) - a(n - 2)*a(n + 1) + 2*a(n - 2)*a(n) + 2*a(n - 1)^2 + 2*a(n - 1)*a(n + 1) - 5*a(n - 1)*a(n) - a(n + 1)*a(n) + 2*a(n)^2

A001768 ext link A001768 ext link 177/43*a(n - 1)^2 + 134/43*a(n - 1)*a(n + 1) - 483/43*a(n - 1)*a(n) - a(n + 1)^2 - a(n + 1)*a(n) + 6*a(n)^2 + 593/43*a(n - 1) + 593/43*a(n + 1) - 1186/43*a(n)

A001768 ext link A001768 ext link 8413/3997*a(n - 2)^2 + 59/14*a(n - 2)*a(n + 1) - 33297/3997*a(n - 2)*a(n) + 37/3997*a(n - 1)^2 - a(n - 1)*a(n + 1) + 8065/7994*a(n - 1)*a(n) - a(n + 1)^2 - a(n + 1)*a(n) + 15961/3997*a(n)^2 + 86/7*a(n - 2) + 172/7*a(n + 1) - 258/7*a(n)

A001768 ext link A001847 ext link 6/11*a(n - 2)*a(n - 1) - 1/11*a(n - 2)*a(n + 1) - 5*a(n - 2)*a(n) - 3/5*a(n - 1)*a(n + 1) + 63/5*a(n - 1)*a(n) - a(n + 1)^2 + 338/55*a(n + 1)*a(n) - 63/5*a(n)^2 - 16*a(n + 1) + 176*a(n)

A001847 ext link A001847 ext link a(n - 2)*a(n + 1) - 11*a(n - 2)*a(n) + 6*a(n - 1)^2 - 33/5*a(n - 1)*a(n + 1) + 63/5*a(n - 1)*a(n) - a(n + 1)^2 + 28/5*a(n + 1)*a(n) - 33/5*a(n)^2 - 16*a(n + 1) + 176*a(n)

A001847 ext link A001847 ext link -11/4800*a(n - 2)*a(n + 1) + 1/4800*a(n - 2)*a(n) - 7/1600*a(n - 1)*a(n + 1) - 3/1600*a(n - 1)*a(n) + 1/960*a(n + 1)^2 - 7/1200*a(n + 1)*a(n) + 21/1600*a(n)^2 - 1/20*a(n - 2) + 1/4*a(n - 1) + 1/15*a(n + 1) - 13/30*a(n) - 1

A001847 ext link