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 A038022 #10 Dec 19 2015 09:51:04 %S A038022 1,0,1,1,2,1,35,51,27,3,13776,18330,9152,2016,164,83306272,104124850, %T A038022 52056277,13006746,1622527,80461 %N A038022 Triangle: T(n,k), k<=n: commutative groupoids with no symmetry with n elements and k idempotents. %H A038022 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %Y A038022 Cf. A001329, A001425, A030258, A030261, A030264. %K A038022 nonn,tabl,more %O A038022 0,5 %A A038022 _Christian G. Bower_, May 15 1998