id:A097630 - OEIS Search Results

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Number of unrooted directed trees on n nodes with a red root.

+0
3

1, 1, 7, 70, 1093, 22426, 578779, 17976302, 653866441, 27270138898, 1283303262151, 67277393090854, 3888789288662029, 245724292311198650, 16851817924083466003, 1246663922538961356766, 98960637955717312632721 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`C. Banderier, J.-M. Le Bars and V. Ravelomanana, Generating functions for kernels of digraphs`
	FORMULA	`E.g.f.: A(x) = 2B - 2BC + C - 2B/C + C^2/2, with B = egf of A052746 and C = egf of A097627.`
	CROSSREFS	`Cf. A097629.` `Sequence in context: A141151 A001669 A051604 this_sequence A090647 A111462 A045713` `Adjacent sequences: A097627 A097628 A097629 this_sequence A097631 A097632 A097633`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Aug 17 2004`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research