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A187891
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a(0)=0, a(1)=5, a(n)=a(n-1)+a(n-2)-1.
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1
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0, 5, 4, 8, 11, 18, 28, 45, 72, 116, 187, 302, 488, 789, 1276, 2064, 3339, 5402, 8740, 14141, 22880, 37020, 59899, 96918, 156816, 253733, 410548, 664280, 1074827, 1739106, 2813932, 4553037, 7366968, 11920004, 19286971, 31206974, 50493944, 81700917
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f. -x^2*(-5+6*x) / ( (x-1)*(x^2+x-1) ). - R. J. Mathar, Mar 15 2011
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MATHEMATICA
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Join[{a=0, b=5}, Table[c=a+b-1; a=b; b=c, {n, 100}]]
nxt[{a_, b_}]:={b, a+b-1}; NestList[nxt, {0, 5}, 40][[All, 1]] (* Harvey P. Dale, Nov 03 2022 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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