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A097631 Number of unrooted directed trees on n nodes with a green root. 1
0, 1, 5, 58, 907, 19046, 496869, 15578130, 570573623, 23929861102, 1131235173433, 59529368839898, 3451899685313523, 218712237867226182, 15034642075916533997, 1114519318895861250082, 88631119148029975177327 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

LINKS

C. Banderier, J.-M. Le Bars and V. Ravelomanana, Generating functions for kernels of digraphs

CROSSREFS

Equals A097629(n) - A097630(n).

Sequence in context: A104099 A129897 A151424 * A130768 A195947 A156326

Adjacent sequences:  A097628 A097629 A097630 * A097632 A097633 A097634

KEYWORD

nonn

AUTHOR

Ralf Stephan, Aug 17 2004

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Last modified February 17 11:18 EST 2012. Contains 206011 sequences.