A055315 - OEIS

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A055315

Number of labeled trees with n nodes and 3 leaves.

4, 60, 720, 8400, 100800, 1270080, 16934400, 239500800, 3592512000, 57081024000, 958961203200, 16999766784000, 317328979968000, 6224529991680000, 128047474114560000, 2757288942600192000 (list; graph; refs; listen; history; internal format)

	OFFSET	`4,1`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`(n!/3!)*stirling2(n-2, n-3). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 28 2004`
	MAPLE	`a:=n->sum((n-j)*n!/3!, j=3..n): seq(a(n), n=4..19); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 29 2007`
	CROSSREFS	`Column 3 of A055314.` `Sequence in context: A002060 A007220 A034866 * A013482 A123480 A156090` `Adjacent sequences: A055312 A055313 A055314 * A055316 A055317 A055318`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), May 11 2000`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.