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A076317 Number of 5-colorable (i.e., chromatic number <= 5) simple graphs on n nodes. 9

%I #12 Mar 10 2023 10:53:17

%S 1,2,4,11,34,155,1037,12257,272513,11885351,1003932892

%N Number of 5-colorable (i.e., chromatic number <= 5) simple graphs on n nodes.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/n-ColorableGraph.html">n-Colorable Graph</a>

%F a(n) = A076316(n) + A076281(n). - _Andrew Howroyd_, Dec 02 2018

%Y Cf. A033995, A076281, A076315, A076316, A076318, A076319, A076320, A076321.

%Y Cf. A215620 (numbers of apex graphs on n vertices).

%K nonn,more

%O 1,2

%A _Eric W. Weisstein_, Oct 06 2002

%E a(10)-a(11) from _Andrew Howroyd_, Dec 02 2018

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)