A144958 - OEIS

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A144958

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

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; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`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: A051437 A034774 A172416 * A034775 A006490 A171160` `Adjacent sequences: A144955 A144956 A144957 * A144959 A144960 A144961`
	KEYWORD	`nonn`
	AUTHOR	`W. Bomfim (webonfim(AT)bol.com.br), Sep 27 2008`

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Last modified February 13 21:55 EST 2012. Contains 205561 sequences.