A243333 Number of simple connected graphs with n nodes that are integral and K_4 free.

1, 1, 1, 1, 2, 5, 5, 9, 15, 38

Offset

1,5

Comments

K_4 is the complete graph on four vertices.

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, 2014

Crossrefs

Cf. A064731 (integral graphs), A079574 (K_4 free graphs).

Sequence in context: A070243 A367642 A050175 * A059797 A173567 A288726

Adjacent sequences: A243330 A243331 A243332 * A243334 A243335 A243336

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 03 2014

Status

approved