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 A211953 #7 Nov 08 2013 23:36:29 %S A211953 6,20,102,520,2628,13482,68747,354500,1840433 %N A211953 Number of distinct regular languages over 4-ary alphabet, whose minimum regular expression has ordinary length n. %H A211953 Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, <a href="http://arxiv.org/abs/1204.4982">Enumerating regular expressions and their languages</a>, arXiv:1204.4982v1 [cs.FL] %K A211953 nonn,hard %O A211953 1,1 %A A211953 _Hermann Gruber_, Apr 26 2012