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Number of simple connected graphs with n nodes that are K_4 free and not integral.
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%I #13 Nov 27 2015 00:01:56

%S 0,0,1,4,15,77,531,5597,95900,2784034

%N Number of simple connected graphs with n nodes that are K_4 free and not integral.

%C K_4 is the complete graph on four vertices.

%H Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a>

%H T. Hoppe and A. Petrone, <a href="http://arxiv.org/abs/1408.3644">Integer sequence discovery from small graphs</a>, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

%Y Cf. A241842 (non-integral graphs), A079574 (K_4-free graphs).

%K nonn,more

%O 1,4

%A _Travis Hoppe_ and _Anna Petrone_, Jun 03 2014