A304124 Number of simple graphs with n vertices which contain no K4 subgraph.

1, 2, 4, 10, 29, 120, 685, 6431, 103164, 2894632, 138892304, 11118977705, 1459412127955

Offset: 1

Author

Brendan McKay, May 06 2018

Keywords

• nonn
• more

Comments

The graphs do not need to be connected.

Crossrefs

Cf. A000088, A006785 (no K3), A115196 (graphs by clique number), A304125 (no K5).

Formula

a(n) = 1+A052450(n)+A052451(n).

Extensions

a(13) from Brendan McKay, May 08 2018