id:A052317 - OEIS Search Results

Search: id:A052317

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Number of labeled trees with n nodes and 2-colored internal (non-leaf) nodes.

+0
4

1, 1, 1, 6, 56, 730, 12372, 259574, 6511920, 190413234, 6364960940, 239556803662, 10028763883272, 462366507311306, 23282257730716740, 1271520006077859750, 74865320814990626912, 4727699146425478764898 (list; graph; listen)

	OFFSET	`0,4`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`E.g.f.: 1+B(x)-x*B(x)-B(x)^2/2 where B(x) is g.f. of A052316.`
	CROSSREFS	`Cf. A004113, A004114, A052316.` `Sequence in context: A053336 A112699 A093197 this_sequence A122743 A137032 A053421` `Adjacent sequences: A052314 A052315 A052316 this_sequence A052318 A052319 A052320`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 15 1999.`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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