id:A001564 - OEIS Search Results

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2nd differences of factorial numbers.
(Formerly M2972 N1202)

+0
13

1, 3, 14, 78, 504, 3720, 30960, 287280, 2943360, 33022080, 402796800, 5308934400, 75203251200, 1139544806400, 18394619443200, 315149522688000, 5711921639424000, 109196040425472000, 2196014181064704000, 46346783255764992000, 1024251745442365440000 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`A. van Heemert, Cyclic permutations with sequences and related problems, J. Reine Angew. Math., 198 (1957), 56-72.`
	LINKS	`Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets` `Index entries for sequences related to factorial numbers`
	FORMULA	`a(n) = (n^2 + n + 1)n! = A002061(n-1)A000142(n) - Mitch Harris (maharri(AT)gmail.com), Jul 10 2008`
	CROSSREFS	`Cf. A047920.` `Sequence in context: A048779 A052186 A074538 this_sequence A059276 A003169 A086621` `Adjacent sequences: A001561 A001562 A001563 this_sequence A001565 A001566 A001567`
	KEYWORD	`nonn,easy,new`
	AUTHOR	`njas`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research