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 A243275 #17 Aug 15 2017 13:55:46 %S A243275 1,0,0,1,1,4,5,35,130,1293,13529,232852,5009335,147950020 %N A243275 Number of graphs with n nodes that are Hamiltonian and triangle-free. %H A243275 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243275 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 A243275 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version a1db88e %Y A243275 Cf. A003216 (Hamiltonian graphs), A024607 (connected triangle-free graphs). %K A243275 nonn,more %O A243275 1,6 %A A243275 _Travis Hoppe_ and _Anna Petrone_, Jun 02 2014 %E A243275 a(11)-a(14) added using tinygraph by _Falk Hüffner_, Aug 15 2017