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Search: id:A068051
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A068051 Number of n-node connected graphs with one cycle, possibly of length 1 or 2. +0
2
1, 2, 4, 9, 20, 49, 118, 300, 765, 1998, 5255, 14027, 37670, 102095, 278262, 763022, 2101905, 5816142, 16153148, 45017423, 125836711, 352723949, 991143727, 2791422887, 7877935985, 22275473767, 63096075118, 179012076933 (list; graph; listen)
OFFSET

1,2
LINKS

C. G. Bower, Transforms (2)

FORMULA

"DIK" transform of A000081.

CROSSREFS

Sequence in context: A000081 A124497 A093637 this_sequence A032289 A006648 A128496

Adjacent sequences: A068048 A068049 A068050 this_sequence A068052 A068053 A068054

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Feb 12 2002

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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