This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A244427 #9 Feb 16 2025 08:33:23 %S A244427 1,1,2,6,9,26,80,340,1690,11432,101142,1228608,20329150 %N A244427 Number of unlabeled, connected graphs on n vertices with no subgraph isomorphic to a bull-graph. %H A244427 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A244427 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 6c1dbe4 %H A244427 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BullGraph.html">Bull Graph</a> %Y A244427 Cf. A079575 (no induced bull subgraph). %K A244427 nonn,more %O A244427 1,3 %A A244427 _Travis Hoppe_ and _Anna Petrone_, Jun 27 2014 %E A244427 a(11)-a(13) added using tinygraph by _Falk Hüffner_, Jul 01 2018