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Number of unlabeled, connected graphs on n vertices with no subgraph isomorphic to a bull-graph.
13

%I #8 Jul 01 2018 10:42:40

%S 1,1,2,6,9,26,80,340,1690,11432,101142,1228608,20329150

%N Number of unlabeled, connected graphs on n vertices with no subgraph isomorphic to a bull-graph.

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

%H F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 6c1dbe4

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

%Y Cf. A079575 (no induced bull subgraph).

%K nonn,more

%O 1,3

%A _Travis Hoppe_ and _Anna Petrone_, Jun 27 2014

%E a(11)-a(13) added using tinygraph by _Falk Hüffner_, Jul 01 2018