id:A034866 - OEIS Search Results

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n!*(n-4)/2, n>4.

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4, 60, 720, 7560, 80640, 907200, 10886400, 139708800, 1916006400, 28021593600, 435891456000, 7192209024000, 125536739328000, 2311968282624000, 44816615940096000, 912338253066240000 (list; graph; listen)

	OFFSET	`4,1`
	REFERENCES	`J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.`
	LINKS	`Index entries for sequences related to factorial numbers`
	FORMULA	`a(n)=A034865(n), n>4. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 20 2008]`
	CROSSREFS	`Sequence in context: A112041 A002060 A007220 this_sequence A055315 A013482 A123480` `Adjacent sequences: A034863 A034864 A034865 this_sequence A034867 A034868 A034869`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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

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