%I A126745
%S A126745 0,0,1,2,11,63,477,5339,94535,2774240
%N A126745 Number of connected graphs on n nodes with clique number 2.
%H A126745 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial 
               Graph Theory</a>
%Y A126745 A diagonal of triangle in A126744.
%Y A126745 Sequence in context: A065928 A114175 A080049 this_sequence A038725 A161947 
               A001565
%Y A126745 Adjacent sequences: A126742 A126743 A126744 this_sequence A126746 A126747 
               A126748
%K A126745 nonn
%O A126745 1,4
%A A126745 N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007