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 A058175 #6 Mar 30 2012 17:37:12 %S A058175 1,0,1,0,1,0,1,3,0,1,9,18,6,1,1,420,638,264,77,8,4,367590,469675, %T A058175 227168,57788,7712,580,18 %N A058175 Triangle: Number of quasigroups of order n with k idempotents. %H A058175 <a href="/index/Qua#quasigroups">Index entries for sequences related to quasigroups</a> %e A058175 1; 0,1; 0,1,0; 1,3,0,1; 9,18,6,1,1; ... %Y A058175 Row sums give A057991. %K A058175 nonn,tabl,more %O A058175 0,8 %A A058175 _Christian G. Bower_, Nov 20 2000