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 A058178 #5 Mar 30 2012 17:37:12 %S A058178 1,0,1,0,1,0,1,1,0,1,3,6,2,1,1,16,34,14,11,4,2,858,1453,854,500,174, %T A058178 38,6 %N A058178 Triangle: Self-converse quasigroups of order n with k idempotents. %H A058178 <a href="/index/Qua#quasigroups">Index entries for sequences related to quasigroups</a> %e A058178 1; 0,1; 0,1,0; 1,1,0,1; 3,6,2,1,1; ... %Y A058178 Row sums give A057993. %K A058178 nonn,tabl,more %O A058178 0,11 %A A058178 _Christian G. Bower_, Nov 20 2000