A243798 Number of connected graphs with n nodes that are chordal and have no subgraph isomorphic to the bull graph.

1, 1, 2, 5, 6, 12, 25, 55, 126, 304, 745, 1893, 4893, 12916, 34562, 93844

Offset

1,3

Links

Table of n, a(n) for n=1..16.

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, 2014

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

Crossrefs

Cf. A048192 (chordal graphs), A244427 (no bull subgraphs).

Sequence in context: A064765 A257805 A082552 * A057683 A277012 A277022

Adjacent sequences: A243795 A243796 A243797 * A243799 A243800 A243801

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 27 2014

Extensions

Definition corrected (connected only) by Falk Hüffner, Jul 01 2018

a(11)-a(16) added using tinygraph by Falk Hüffner, Jul 01 2018

Status

approved