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 A243338 #10 Nov 26 2015 14:30:13 %S A243338 0,0,1,2,2,5,10,23,47,105 %N A243338 Number of simple connected graphs with n nodes that are trees and not integral. %H A243338 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243338 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 %Y A243338 Cf. A241842 (non-integral graphs), A000055 (tree graphs). %K A243338 nonn,more %O A243338 1,4 %A A243338 _Travis Hoppe_ and _Anna Petrone_, Jun 03 2014