%I A126756
%S A126756 0,0,0,0,1,1,8,36,269,2418,29216,458445,9373692,249530113
%N A126756 Number of biconnected triangle-free graphs on n nodes with chromatic 
               number 3.
%C A126756 It is possible that the definition should say "connected" rather than 
               "biconnected". Should be rechecked! - Max Alekseyev and Brendan McKay, 
               Jun 17 2008
%H A126756 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial 
               Graph Theory</a>
%Y A126756 Sequence in context: A032770 A032794 A000757 this_sequence A058823 A050536 
               A110215
%Y A126756 Adjacent sequences: A126753 A126754 A126755 this_sequence A126757 A126758 
               A126759
%K A126756 nonn
%O A126756 1,7
%A A126756 N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007