A126737 Number of connected graphs on n nodes with chromatic number 3.

0, 0, 1, 2, 12, 64, 475, 5036, 80947, 2010328, 76115143

Offset: 1

Author

N. J. A. Sloane, Feb 16 2007

Keywords

• nonn

Links

• Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

A diagonal of triangle in A126736.

Extensions

a(11) from Michael Sollami, Jan 29 2012