%I A006786 M1149
%S A006786 1,2,4,8,18,44,117,351,1230,5069,25181,152045,1116403,9899865,104980369,
%T A006786 1318017549,19427531763
%N A006786 Square-free graphs on n vertices.
%D A006786 B. D. McKay, personal communication.
%D A006786 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A006786 B. D. McKay, <a href="http://cs.anu.edu.au/~bdm/publications.html">Isomorph-free 
               exhaustive generation, J Algorithms, 26 (1998) 306-324.</a>
%H A006786 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Square-FreeGraph.html">Square-Free Graph</a>
%Y A006786 Cf. A077269.
%Y A006786 Sequence in context: A114203 A100132 A088457 this_sequence A125809 A000117 
               A006771
%Y A006786 Adjacent sequences: A006783 A006784 A006785 this_sequence A006787 A006788 
               A006789
%K A006786 nonn
%O A006786 1,2
%A A006786 N. J. A. Sloane (njas(AT)research.att.com).
%E A006786 2 more terms (from the McKay paper) from Vladeta Jovovic (vladeta(AT)eunet.rs), 
               May 17 2008