%I A007869
%S A007869 1,1,2,6,18,78,522,6178,137352,6002584,509498932,82545586656,
%T A007869 25251015686776,14527077828617744,15713242984902154384,
%U A007869 32000507852263779299344,122967932076766466347469888
%N A007869 Complementary pairs of graphs on n nodes. Also unlabeled graphs with 
               n nodes and an even number of edges.
%H A007869 P. J. Cameron, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">
               Sequences realized by oligomorphic permutation groups</a>, J. Integ. 
               Seqs. Vol. 3 (2000), #00.1.5.
%Y A007869 Average of A000088 and A000171, the latter interspersed with zeros.
%Y A007869 Cf. A054960 for graphs with an odd number of edges.
%Y A007869 Sequence in context: A162058 A113844 A141580 this_sequence A118476 A144557 
               A118455
%Y A007869 Adjacent sequences: A007866 A007867 A007868 this_sequence A007870 A007871 
               A007872
%K A007869 nonn,nice
%O A007869 1,3
%A A007869 Peter Cameron (P.J.Cameron(AT)qmw.ac.uk)
%E A007869 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 19 2000