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Number of simple class-2 graphs on n nodes.
2

%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