A126752 Number of biconnected graphs on n nodes with chromatic number 4.

0, 0, 0, 1, 2, 17, 189, 3627, 118114, 6530233, 596566067

Offset: 1

Author

N. J. A. Sloane, Feb 18 2007

Keywords

• nonn
• more

Comments

It is possible that the definition should say "connected" rather than "biconnected". Should be rechecked! - Max Alekseyev and Brendan McKay, Jun 17 2008

Links

• Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

A diagonal of triangle in A126749.

Extensions

a(11) from Michael Sollami, Feb 18 2012