%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