A243247 Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to an open-bowtie graph.

0, 0, 0, 0, 10, 78, 755, 10709, 259123, 11703831, 1006591916, 164058548700, 50335887082115

Offset

1,5

Links

Table of n, a(n) for n=1..13.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014

Eric Weisstein's World of Mathematics, Bull Graph

Formula

a(n) = A001349(n) - A242791(n).

Crossrefs

Sequence in context: A316595 A348314 A056986 * A222701 A283658 A160655

Adjacent sequences: A243244 A243245 A243246 * A243248 A243249 A243250

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 01 2014

Extensions

a(11)-a(13) added using formula by Falk Hüffner, Jan 16 2016

Status

approved