A243557 Number of simple connected graphs with n nodes that are non-integral and have no subgraph isomorphic to bull graph.

0, 0, 1, 4, 8, 23, 78, 337, 1690, 11418

Offset

1,4

Links

Table of n, a(n) for n=1..10.

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.

Crossrefs

Cf. A244427 (no-bull subgraphs), A241842 (non-integral graphs).

Sequence in context: A274521 A026596 A181688 * A316687 A083504 A277291

Adjacent sequences: A243554 A243555 A243556 * A243558 A243559 A243560

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 06 2014

Status

approved