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 A030271 #8 Mar 30 2012 17:37:01 %S A030271 1,4,1431,75491208 %N A030271 Number of nonisomorphic groupoids with 1 idempotent and no symmetry. %H A030271 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %K A030271 nonn,more %O A030271 1,2 %A A030271 _Christian G. Bower_