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 A058148 #5 Mar 30 2012 17:37:11 %S A058148 1,3,9,30,175,3333 %N A058148 Monoids of order n with 2 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). %H A058148 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %Y A058148 Column 2 of A058147. %K A058148 nonn,more %O A058148 2,2 %A A058148 _Christian G. Bower_, Nov 14 2000