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 A058134 #6 Mar 30 2012 17:37:11 %S A058134 1,2,4,13,49,247,1486 %N A058134 Number of asymmetric commutative monoids (semigroups with identity) of order n. %H A058134 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %K A058134 nonn,more %O A058134 1,2 %A A058134 _Christian G. Bower_, Nov 13 2000