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%I #18 Sep 03 2019 19:51:09
%S 0,0,1,1,6,11,50,131,1131
%N Number of simple class-2 graphs on n nodes.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Class2Graph.html">Class 2 Graph</a>
%F a(n) = A000088(n) - A099435(n). - _Andrew Howroyd_, Sep 03 2019
%Y Cf. A000088 (graphs).
%Y Cf. A099438 (connected class 2 graphs).
%Y Cf. A099435 (class 1 graphs).
%K nonn,more
%O 1,5
%A _Eric W. Weisstein_, Oct 15 2004
%E a(8) from _Eric W. Weisstein_, Nov 17 2011
%E a(9) from _Eric W. Weisstein_, Nov 21 2011
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