The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #11 Aug 15 2019 16:52:52
%S 0,0,1,2,11,63,477,5339,94535,2774240,135794730
%N Number of connected graphs on n nodes with clique number 3.
%H Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a>
%Y A diagonal of triangle in A126744.
%K nonn,hard,more
%O 1,4
%A _N. J. A. Sloane_, Feb 18 2007
%E a(11) from _Michael Sollami_, Jan 29 2012