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 A058140 #10 May 22 2015 07:45:09 %S A058140 1,1,1,0,3,1,0,6,10,3,0,14,47,55,12,0,124,267,490,395,68,0,4510,2230, %T A058140 4460,5971,3324,502,0 %N A058140 Triangle read by rows: number of asymmetric monoids of order n with k idempotents. %H A058140 <a href="/index/Mo#monoids">Index entries for sequences related to monoids</a> %e A058140 1; %e A058140 1,1; %e A058140 0,3,1; %e A058140 0,6,10,3; %e A058140 0,14,47,55,12; %e A058140 ... %Y A058140 Row sums give A058130. Main diagonal: A058115(n-1). Column 2: A058141. %K A058140 nonn,tabl,more %O A058140 1,5 %A A058140 _Christian G. Bower_, Nov 14 2000