id:A001475 - OEIS Search Results

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a(n) = a(n-1) + n a(n-2).
(Formerly M1449 N0573)

+0
3

1, 2, 5, 13, 38, 116, 382, 1310, 4748, 17848, 70076, 284252, 1195240, 5174768, 23103368, 105899656, 498656912, 2404850720, 11879332048, 59976346448 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 86 (divided by 2).`
	FORMULA	`E.g.f.: 1/2(1+x)exp(x+1/2*x^2)-1/2. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 04 2003`
	CROSSREFS	`Equals (1/2) A000085(n+1). Cf. A001189, A013989.` `Sequence in context: A053732 A119495 A064384 this_sequence A000800 A006823 A022894` `Adjacent sequences: A001472 A001473 A001474 this_sequence A001476 A001477 A001478`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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