A243788 Number of graphs with n nodes that are chordal and are K_4 free.

1, 1, 2, 4, 11, 35, 124, 500, 2224, 10640, 53920, 285535, 1563849, 8798306

Offset

1,3

Comments

K_4 is the complete graph on four vertices.

Links

Table of n, a(n) for n=1..14.

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 69d4186

Crossrefs

Cf. A048192 (chordal graphs), A079574 (K_4 free graphs).

Sequence in context: A340338 A107378 A186998 * A245465 A219861 A193058

Adjacent sequences: A243785 A243786 A243787 * A243789 A243790 A243791

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 27 2014

Extensions

a(11)-a(14) added using tinygraph by Falk Hüffner, Jan 15 2016

Status

approved