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 A058110 #5 Mar 30 2012 17:37:11 %S A058110 3,9,50,309,2806,58583 %N A058110 Semigroups of order n with 2 idempotents. %H A058110 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %Y A058110 Column 2 of A058108. %K A058110 nonn,hard %O A058110 2,1 %A A058110 _Christian G. Bower_, Nov 09 2000 %E A058110 Updated Feb 19 2001