A129860 - OEIS

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A129860

Number of unrooted bifurcating tree shapes with n leaves.

1, 1, 1, 2, 2, 4, 6, 12, 18, 41, 66, 154, 265, 628, 1132, 2748, 5098, 12444 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,4`
	REFERENCES	`Joseph Felsenstein, Inferring Phylogenies. Sinauer Associates, Inc., 2004, pg. 33`
	CROSSREFS	`Sequence in context: A195204 A154779 A010101 * A028408 A037163 A059123` `Adjacent sequences: A129857 A129858 A129859 * A129861 A129862 A129863`
	KEYWORD	`nonn`
	AUTHOR	`Barry Cipra (bcipra(AT)rconnect.com), May 23 2007`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.