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 A058136 #6 Mar 30 2012 17:37:11 %S A058136 1,2,4,16,91,833,11771 %N A058136 Number of asymmetric monoids (semigroups with identity) of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). %H A058136 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %Y A058136 a(n)=(A058130(n)+A058135(n))/2. %K A058136 nonn,more %O A058136 1,2 %A A058136 _Christian G. Bower_, Nov 13 2000