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Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to an open-bowtie graph.
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%I #21 Jan 16 2016 12:00:30

%S 0,0,0,0,10,78,755,10709,259123,11703831,1006591916,164058548700,

%T 50335887082115

%N Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to an open-bowtie graph.

%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

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/BullGraph.html">Bull Graph</a>

%F a(n) = A001349(n) - A242791(n).

%K nonn,more

%O 1,5

%A _Travis Hoppe_ and _Anna Petrone_, Jun 01 2014

%E a(11)-a(13) added using formula by _Falk Hüffner_, Jan 16 2016