id:A002999 - OEIS Search Results

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Expansion of (1+x*exp(x))^2.

+0
3

1, 2, 6, 18, 56, 170, 492, 1358, 3600, 9234, 23060, 56342, 135192, 319514, 745500, 1720350, 3932192, 8912930, 20054052, 44826662, 99614760, 220201002, 484442156, 1061158958, 2315255856, 5033164850 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(0) = 1, a(n) = (n^2-n)2^n/4 + 2n. a(n) = A003013(n) + n = A001815(n) + 2n. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 02 2003`
	CROSSREFS	`Cf. A048482, A001787, A005183.` `Adjacent sequences: A002996 A002997 A002998 this_sequence A003000 A003001 A003002` `Sequence in context: A066158 A148456 A148457 this_sequence A091142 A111961 A071721`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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