A126751 Number of biconnected graphs on n nodes with chromatic number 3.

0, 0, 1, 1, 6, 30, 232, 2762, 50814, 1420183, 58836784

Offset: 1

Author

N. J. A. Sloane, Feb 18 2007

Keywords

• nonn
• more

Links

• Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

A diagonal of triangle in A126749.

The sequence for "connected" is A126737.

Extensions

a(11) from Michael Sollami, Feb 18 2012