A076319 Number of 7-colorable (i.e., chromatic number <= 7) simple graphs on n nodes.

1, 2, 4, 11, 34, 156, 1044, 12345, 274659, 12004993, 1018989417

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, A076283, A076315, A076316, A076317, A076318, A076320, A076321.

Formula

a(n) = A076318(n) + A076283(n). - Andrew Howroyd, Dec 02 2018

Extensions

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