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 A030252 #9 Mar 30 2012 17:37:00 %S A030252 0,0,2,9,15376 %N A030252 Number of nonisomorphic groupoids with no idempotents and a nontrivial symmetry. %H A030252 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %Y A030252 Cf. A030250 - A030251. %K A030252 nonn,more %O A030252 0,3 %A A030252 _Christian G. Bower_