A126741 Number of connected triangle-free graphs on n nodes with chromatic number 4.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 23, 1085, 75127, 6384013

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

See A116079 for further information.

Extensions

a(15) from Michael Sollami, Feb 04 2012