A036250 - OEIS

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A036250

Number of trees of nonempty sets with n points. (Each node is a set of 1 or more points.)

1, 1, 2, 3, 7, 14, 35, 85, 231, 633, 1845, 5461, 16707, 51945, 164695, 529077, 1722279, 5664794, 18813369, 62996850, 212533226, 721792761, 2466135375, 8471967938, 29249059293, 101440962296, 353289339927, 1235154230060 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`G.f. B(x)-B^2(x)/2+B(x^2)/2, where B(x) is g.f. for A036249.`
	CROSSREFS	`Essentially the same as A036251. Cf. A000055, A038052.` `Sequence in context: A185089 A180564 A113822 * A191491 A006660 A123777` `Adjacent sequences: A036247 A036248 A036249 * A036251 A036252 A036253`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 15 1998.`

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Last modified February 17 18:01 EST 2012. Contains 206061 sequences.