A076318 Number of 6-colorable (i.e., chromatic number <= 6) simple graphs on n nodes.

1, 2, 4, 11, 34, 156, 1043, 12338, 274541, 12000742, 1018595454

Offset: 1

Author

Eric W. Weisstein, Oct 06 2002

Keywords

• nonn
• more

Links

• Eric Weisstein's World of Mathematics, n-Colorable Graph

Crossrefs

Cf. A033995, A076282, A076315, A076316, A076317, A076319, A076320, A076321.

Formula

a(n) = A076317(n) + A076282(n). - Andrew Howroyd, Dec 02 2018

Extensions

a(10)-a(11) from Andrew Howroyd, Dec 02 2018