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 A030251 #8 Mar 30 2012 17:37:00 %S A030251 1,0,1,969,56615456 %N A030251 Number of nonisomorphic groupoids with no idempotents and no symmetry. %H A030251 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %K A030251 nonn,more %O A030251 0,4 %A A030251 _Christian G. Bower_