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%I #3 Mar 30 2012 16:50:37
%S 0,0,1,4,8,26,58,185,500,1677
%N Number of connected graphs on n nodes with edge chromatic number 3.
%H Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a>
%Y A diagonal of triangle in A126732.
%K nonn
%O 1,4
%A _N. J. A. Sloane_, Feb 16 2007
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