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A144959 A134955(n) - A134955(n-1). 1
0, 1, 2, 5, 11, 30, 78, 223, 658, 2026, 6429, 21015, 70233, 239360, 829224, 2912947, 10356334, 37205121, 134887153, 493000086, 1814902409, 6724595543, 25061885217, 93899071368, 353514105817, 1336822098961, 5075833932200 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

COMMENTS

a(n) is the number of hyperforests with n unlabeled nodes without isolated vertices. This follows from the fact that for n>0 A134955(n-1) counts the hyperforests of order n with one or more isolated nodes.

CROSSREFS

Cf. A134955, A144958(unlabeled forests without isolated vertices).

Sequence in context: A176637 A059075 A121134 * A131347 A079225 A139466

Adjacent sequences:  A144956 A144957 A144958 * A144960 A144961 A144962

KEYWORD

nonn

AUTHOR

W. Bomfim (webonfim(AT)bol.com.br), Sep 27 2008

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.