A243327 Number of simple connected graphs with n nodes that are K_4 free and not integral.

0, 0, 1, 4, 15, 77, 531, 5597, 95900, 2784034

Offset

1,4

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 [math.CO], 2014.

Crossrefs

Cf. A241842 (non-integral graphs), A079574 (K_4-free graphs).

Sequence in context: A178887 A002467 A332652 * A179511 A111726 A090376

Adjacent sequences: A243324 A243325 A243326 * A243328 A243329 A243330

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 03 2014

Status

approved