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Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes.
3

%I #10 Dec 02 2018 12:53:46

%S 1,1,4,38,727,26538,1832900,241187797,60807843592,29307734588670,

%T 26725594885115575

%N Number of connected labeled 4-colorable (i.e., chromatic number <= 4) 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 Logarithmic transform of A084280. - _Andrew Howroyd_, Dec 02 2018

%Y Cf. A001832, A084274, A084280, A084283, A084285, A084286.

%K nonn,more

%O 1,3

%A _Eric W. Weisstein_, May 25 2003

%E a(7)-a(11) from _Andrew Howroyd_, Dec 02 2018