A027089 a(n) = A027082(n, 2n-2).

1, 5, 14, 39, 108, 299, 828, 2299, 6401, 17875, 50062, 140601, 395933, 1117737, 3162812, 8969267, 25487555, 72565339, 206969662, 591304797, 1691991626, 4848703909, 13914119144, 39980978277, 115023510495, 331303274449

Offset

2,2

Links

Table of n, a(n) for n=2..27.

Formula

Conjecture: D-finite with recurrence -(n+2)*(244*n-1065)*a(n) +3*(n+1)*(422*n -1703)*a(n-1) +2*(-359*n^2 +1211*n -1420)*a(n-2) +2*(-1174*n^2 +6319*n -7410)*a(n-3) +(-760*n^2 +2173*n +1616)*a(n-4) +(-502*n^2 +2245*n -1123)*a(n-5) +6*(23*n-67) *(n-5)*a(n-6)=0. - R. J. Mathar, Jun 24 2020

Crossrefs

Cf. A027082.

Sequence in context: A024525 A209536 A119996 * A184437 A023871 A274598

Adjacent sequences: A027086 A027087 A027088 * A027090 A027091 A027092

Keyword

nonn

Author

Clark Kimberling

Status

approved