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 A058141 #6 Mar 30 2012 17:37:11 %S A058141 1,3,6,14,124,4510 %N A058141 Number of asymmetric monoids of order n with 2 idempotents. %H A058141 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %Y A058141 Column 2 of A058140. %K A058141 nonn,more %O A058141 2,2 %A A058141 _Christian G. Bower_, Nov 14 2000