id:A036363 - OEIS Search Results

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Line-labeled 2-trees with n nodes.

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1, 30, 2940, 612360, 221371920, 123506903520, 98513415000000, 106466143825641600, 149822417112092524800, 266259578976734741798400, 583256031964344606759091200, 1544112027465820312500000000000, 4860420955731492909364541975040000 (list; graph; listen)

	OFFSET	`3,2`
	REFERENCES	`F. Harary and E. Palmer, Graphical Enumeration, (1973), p. 30, Problem 1.13(c).`
	LINKS	`Index entries for sequences related to trees`
	MAPLE	`[ seq((2n-3)!(2n-3)^(n-4)/(2(n-2)!), n=3..20) ];`
	CROSSREFS	`Sequence in context: A138916 A091544 A108091 this_sequence A001459 A115465 A152131` `Adjacent sequences: A036360 A036361 A036362 this_sequence A036364 A036365 A036366`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

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