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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

%I

%S 1,1,2,6,24,2399,6299,28222,169338,1244136,213748501,914608501,

%T 6392593442,57693964614,618160168824,150820728557099,895583729570699,

%U 8513087005239262,102642351647368962,1446049101566437896

%N 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.

%t 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}]

%K nonn

%O 1,3

%A _Roger L. Bagula_, Oct 01 2006

%E Edited by _N. J. A. Sloane_, Oct 04 2006

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Last modified June 12 14:45 EDT 2021. Contains 344957 sequences. (Running on oeis4.)