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 A243558 #16 May 09 2019 17:51:35 %S A243558 1,1,2,6,9,25,76,302,1360,7606,49313,368568,3046968 %N A243558 Number of simple connected graphs with n nodes that are planar and have no subgraph isomorphic to bull graph. %H A243558 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243558 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, 2014 %H A243558 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 9766535. %Y A243558 Cf. A244427 (no bull subgraphs), A003094 (planar graphs). %K A243558 nonn,more %O A243558 1,3 %A A243558 _Travis Hoppe_ and _Anna Petrone_, Jun 06 2014 %E A243558 a(11)-a(13) added using tinygraph by _Falk Hüffner_, May 09 2019