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0, 1, 3, 10, 38, 177, 999, 6676, 51564, 451585, 4418555, 47746686, 564528978, 7247396065, 100378220943, 1491699317032, 23673159231704, 399553959924801, 7146023007880179, 134997604341408370, 2686037319660797310, 56143557248353416721, 1229914413684635491703
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OFFSET
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0,3
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LINKS
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FORMULA
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D-finite with recurrence: (-n+2)*a(n) +(n-1)^2*a(n-1) +2*(-n+2)*a(n-2) +(-n^2+4*n-2)*a(n-3) +(n-1)*a(n-4)=0. - R. J. Mathar, Jul 15 2015
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MAPLE
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b:= proc(n) b(n):= `if`(n<2, 1, n*b(n-1)-b(n-2)+1+(-1)^n) end:
a:= n-> `if`(n=0, 0, b(n-1)+b(n)-1):
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MATHEMATICA
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b[n_] := b[n] = If[n<2, 1, n*b[n-1] - b[n-2] + 1 + (-1)^n];
a[n_] := If[n == 0, 0, b[n-1] + b[n] - 1];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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