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Search: id:A123026
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| A123026 |
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Let a0 = 1; b0 = -2; c0 = -1; a(n) = a(n-2)*(a0*n^2+b0*n+c0)/(n*(n-1)). |
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+0
1
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| 1, 1, -1, 2, -7, 28, -161, 952, -7567, 59024, -597793, 5784352, -71137367, 821377984, -11879940289, 159347328896, -2649226684447, 40474221539584, -760328058436289, 13032699335746048, -272957772978627751, 5187014335626927104, -119828462337617582689, 2500140909772178864128
(list; graph; listen)
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OFFSET
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0,4
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MATHEMATICA
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a0 = 1; b0 = -2; c0 = -1; a[n_] := a[n] = (a0*n^2 + b0*n + c0)*a[n - 2]/(n*(n - 1)); a[0] = 1; a[1] = 1; Table[ExpandAll[a[n]*n! ], {n, 0, 30}]
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CROSSREFS
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Adjacent sequences: A123023 A123024 A123025 this_sequence A123027 A123028 A123029
Sequence in context: A030897 A030946 A030906 this_sequence A013011 A013181 A122118
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KEYWORD
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sign
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 24 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 01 2006
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