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 A243557 #18 Nov 27 2015 00:02:14 %S A243557 0,0,1,4,8,23,78,337,1690,11418 %N A243557 Number of simple connected graphs with n nodes that are non-integral and have no subgraph isomorphic to bull graph. %H A243557 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243557 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. %Y A243557 Cf. A244427 (no-bull subgraphs), A241842 (non-integral graphs). %K A243557 nonn,more %O A243557 1,4 %A A243557 _Travis Hoppe_ and _Anna Petrone_, Jun 06 2014