id:A136797 - OEIS Search Results

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Number of labeled marked trees with n nodes.

+0
3

2, 8, 96, 2048, 64000, 2654208, 137682944, 8589934592, 626913312768, 52428800000000, 4944974716076032, 519400496868360192, 60134924074807721984, 7609328110443312447488 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A marked tree is a tree where each node and edge is marked as + or -.`
	REFERENCES	`F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, pg 293 (4.1.60)`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`a(n) = A136796(n)/n.`
	CROSSREFS	`Sequence in context: A098272 A087540 A052713 this_sequence A009752 A137704 A001417` `Adjacent sequences: A136794 A136795 A136796 this_sequence A136798 A136799 A136800`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 21 2008`

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

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