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 A243276 #13 Aug 13 2017 16:30:17 %S A243276 1,0,1,2,5,29,188,2481,52499,1857651,104392105 %N A243276 Number of graphs with n nodes that are Hamiltonian and have no induced subgraph isomorphic to K_4. %C A243276 K_4 is the complete graph on four vertices. %H A243276 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243276 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 A243276 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 4361e42 %Y A243276 Cf. A003216 (Hamiltonian graphs), A079574 (connected K_4 free graphs). %K A243276 nonn,more %O A243276 1,4 %A A243276 _Travis Hoppe_ and _Anna Petrone_, Jun 02 2014 %E A243276 a(11) added using tinygraph by _Falk Hüffner_, Aug 13 2017