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A152456 a(n)=1*(n+2)!-2*(n+1)!-3*n!. 0
-3, -1, 6, 54, 408, 3240, 28080, 267120, 2782080, 31570560, 388281600, 5149267200, 73287244800, 1114636723200, 18045906278400, 309918825216000, 5628230479872000, 107773290713088000, 2170404686241792000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

a[n_]:=1*(n+2)!-2*(n+1)!-3*n!;

CROSSREFS

Sequence in context: A157866 A221852 A025230 * A128605 A051511 A272030

Adjacent sequences:  A152453 A152454 A152455 * A152457 A152458 A152459

KEYWORD

sign

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 05 2008

STATUS

approved

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Last modified February 21 18:45 EST 2019. Contains 320376 sequences. (Running on oeis4.)