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