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 A243787 #19 Sep 03 2019 20:02:28 %S A243787 1,1,2,5,14,52,228,1209,7463,52520,407856,3414672,30229061,279124327 %N A243787 Number of graphs with n nodes that are chordal and planar. %H A243787 Aharon Davidson, <a href="https://arxiv.org/abs/1907.03090">From Planck Area to Graph Theory: Topologically Distinct Black Hole Microstates</a>, arXiv:1907.03090 [gr-qc], 2019. %H A243787 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243787 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 [math.CO], 2014. %H A243787 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties. %Y A243787 Cf. A048192 (chordal graphs), A003094 (planar graphs). %K A243787 nonn,more %O A243787 1,3 %A A243787 _Travis Hoppe_ and _Anna Petrone_, Jun 27 2014 %E A243787 a(11)-a(14) added using tinygraph by _Falk Hüffner_, May 12 2019