A152456 - OEIS

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A152456

a(n)=1*(n+2)!-2*(n+1)!-3*n!.

-3, -1, 6, 54, 408, 3240, 28080, 267120, 2782080, 31570560, 388281600, 5149267200, 73287244800, 1114636723200, 18045906278400, 309918825216000, 5628230479872000, 107773290713088000, 2170404686241792000 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	MATHEMATICA	`a[n_]:=1(n+2)!-2(n+1)!-3*n!;`
	CROSSREFS	`Sequence in context: A156363 A157866 A025230 * A128605 A051511 A026499` `Adjacent sequences: A152453 A152454 A152455 * A152457 A152458 A152459`
	KEYWORD	`sign`
	AUTHOR	`Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 05 2008`

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Last modified February 13 08:12 EST 2012. Contains 205451 sequences.