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%I #10 Dec 02 2018 12:53:23
%S 1,1,4,37,667,21886,1262719,125387767,21009091072,5809425721381,
%T 2596693747042999,1844571022305443422
%N Number of connected labeled 3-colorable (i.e., chromatic number <= 3) 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 A084279. - _Andrew Howroyd_, Dec 02 2018
%Y Cf. A001832, A084273, A084279, A084283, A084284, A084285, A084286.
%K nonn,more
%O 1,3
%A _Eric W. Weisstein_, May 25 2003
%E a(7)-a(12) from _Andrew Howroyd_, Dec 02 2018
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