A244427 Number of unlabeled, connected graphs on n vertices with no subgraph isomorphic to a bull-graph.

1, 1, 2, 6, 9, 26, 80, 340, 1690, 11432, 101142, 1228608, 20329150

Offset

1,3

Links

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

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 6c1dbe4

Eric Weisstein's World of Mathematics, Bull Graph

Crossrefs

Cf. A079575 (no induced bull subgraph).

Sequence in context: A006746 A205875 A243558 * A121624 A103019 A101823

Adjacent sequences: A244424 A244425 A244426 * A244428 A244429 A244430

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 27 2014

Extensions

a(11)-a(13) added using tinygraph by Falk Hüffner, Jul 01 2018

Status

approved