%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