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 A058119 #6 Mar 30 2012 17:37:11 %S A058119 1,2,5,18,93,930,22899 %N A058119 Number of self-converse semigroups of order n with 1 idempotent. %H A058119 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %Y A058119 Column 1 of A058118. %K A058119 nonn,hard %O A058119 1,2 %A A058119 _Christian G. Bower_, Nov 10 2000