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 A243788 #13 Jan 15 2016 14:56:22 %S A243788 1,1,2,4,11,35,124,500,2224,10640,53920,285535,1563849,8798306 %N A243788 Number of graphs with n nodes that are chordal and are K_4 free. %C A243788 K_4 is the complete graph on four vertices. %H A243788 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243788 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 A243788 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 69d4186 %Y A243788 Cf. A048192 (chordal graphs), A079574 (K_4 free graphs). %K A243788 nonn,more %O A243788 1,3 %A A243788 _Travis Hoppe_ and _Anna Petrone_, Jun 27 2014 %E A243788 a(11)-a(14) added using tinygraph by _Falk Hüffner_, Jan 15 2016