

A243559


Number of simple connected graphs with n nodes that have no subgraph isomorphic to bull graph or K_4.


0



1, 1, 2, 5, 9, 26, 80, 340, 1690, 11432, 101142, 1228608, 20329150
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,3


COMMENTS

K_4 is the complete graph with four vertices.


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, 2014
F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 29e68fa.


CROSSREFS

Cf. A244427 (no bull subgraphs), A079574 (K_4 free graphs).
Sequence in context: A006405 A305189 A344394 * A334077 A136108 A026297
Adjacent sequences: A243556 A243557 A243558 * A243560 A243561 A243562


KEYWORD

nonn,more


AUTHOR

Travis Hoppe and Anna Petrone, Jun 06 2014


EXTENSIONS

a(11)a(13) added using tinygraph by Falk Hüffner, Sep 23 2020


STATUS

approved



