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Search: id:A154232
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| A154232 |
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List of pairs: sum and product recursions:{a(n),b(n)}; a(n)=(n^2-n-1)+a(n-1); b(n)=(n^2-n-1)*b(n-1). |
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1
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| 0, 1, -1, -1, 0, -1, 5, -5, 16, -55, 35, -1045, 64, -30305, 105, -1242505, 160, -68337775, 231, -4851982025, 320, -431826400225, 429, -47069077624525, 560, -6166049168812775, 715, -955737621165980125, 896, -172988509431042402625
(list; graph; listen)
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OFFSET
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0,7
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FORMULA
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a(n)=(n^2-n-1)+a(n-1); b(n)=(n^2-n-1)*b(n-1).
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MATHEMATICA
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Clear[a, b, n]; a[0] = 0; a[n_] := a[n] = n^2 - n - 1 + a[n - 1];
b[0] = 1; b[n_] := b[n] = (n^2 - n - 1)*b[n - 1];
Flatten[Table[{a[n], b[n]}, {n, 0, 15}]]
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CROSSREFS
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Sequence in context: A050341 A140360 A145599 this_sequence A072272 A079317 A125256
Adjacent sequences: A154229 A154230 A154231 this_sequence A154233 A154234 A154235
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KEYWORD
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sign,uned,tabf
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 05 2009
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