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 A243798 #15 Jul 01 2018 10:43:01 %S A243798 1,1,2,5,6,12,25,55,126,304,745,1893,4893,12916,34562,93844 %N A243798 Number of connected graphs with n nodes that are chordal and have no subgraph isomorphic to the bull graph. %H A243798 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243798 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 A243798 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 6c1dbe4 %Y A243798 Cf. A048192 (chordal graphs), A244427 (no bull subgraphs). %K A243798 nonn,more %O A243798 1,3 %A A243798 _Travis Hoppe_ and _Anna Petrone_, Jun 27 2014 %E A243798 Definition corrected (connected only) by _Falk Hüffner_, Jul 01 2018 %E A243798 a(11)-a(16) added using tinygraph by _Falk Hüffner_, Jul 01 2018