id:A144958 - OEIS Search Results

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A005195(n) - A005195(n-1).

+0
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0, 1, 1, 3, 4, 10, 17, 39, 77, 176, 381, 891, 2057, 4941, 11915, 29391, 73058, 184236, 468330, 1202349, 3108760, 8097518, 21218776, 55925742, 148146312, 394300662, 1053929982, 2828250002, 7617271738, 20584886435, 55802753243 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(n) is the number of forests with n unlabeled nodes without isolated vertices. This follows from the fact that for n>0 A005195(n-1) counts the forests with one or more isolated nodes.`
	CROSSREFS	`Cf. A005195, A144959.` `Sequence in context: A081160 A051437 A034774 this_sequence A034775 A006490 A139797` `Adjacent sequences: A144955 A144956 A144957 this_sequence A144959 A144960 A144961`
	KEYWORD	`nonn`
	AUTHOR	`W. Bomfim (webonfim(AT)bol.com.br), Sep 27 2008`

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.

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