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 A058169 #6 Mar 30 2012 17:37:12 %S A058169 1,2,1,3,5,1,9,19,14,2,52,82,88,43,6,624,470,556,410,162,24,19027, %T A058169 4444,3771,3501,2088,731,110 %N A058169 Triangle: Number of asymmetric self-converse semigroups of order n with k idempotents. %H A058169 <a href="/index/Se#semigroups">Index entries for sequences related to semigroups</a> %e A058169 1; 2,1; 3,5,1; 9,19,14,2; 52,82,88,43,6; ... %Y A058169 Row sums give A058106. %K A058169 nonn,tabl,hard %O A058169 1,2 %A A058169 _Christian G. Bower_, Nov 19 2000