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 A123150 a(n)=f(n)*a[n - 5]/(n*(n - 1)*(n - 2)*(n - 3)*(n - 4)) where f(n)=n^5 - n^4 - n^3 + n^2 - 1. 0
 1, 1, 2, 6, 24, 2399, 6299, 28222, 169338, 1244136, 213748501, 914608501, 6392593442, 57693964614, 618160168824, 150820728557099, 895583729570699, 8513087005239262, 102642351647368962, 1446049101566437896 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS MATHEMATICA Clear[a] f[n_] = n^5 - n^4 - n^3 + n^2 - 1 a[n_] := a[n] = f[n]*a[n - 5]/(n*(n - 1)*(n - 2)*(n - 3)*(n - 4)); a[0] = 1; a[1] = 1; a[2] = 1; a[3] = 1; a[4] = 1; Table[a[n]*n!, {n, 0, 30}] CROSSREFS Sequence in context: A227886 A290961 A089718 * A086591 A173609 A294945 Adjacent sequences:  A123147 A123148 A123149 * A123151 A123152 A123153 KEYWORD nonn AUTHOR Roger L. Bagula, Oct 01 2006 EXTENSIONS Edited by N. J. A. Sloane, Oct 04 2006 STATUS approved

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Last modified October 16 11:23 EDT 2019. Contains 328056 sequences. (Running on oeis4.)