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 A228726 #7 Sep 01 2013 23:07:46 %S A228726 1,1,1,2,1,1,2,1,2,9,1,1,3,1,3,9,1,5,9,28,1,1,3,1,3,10,1,5,11,28,1,5, %T A228726 12,28 %N A228726 Number a(n) of columns in each row of the irregular triangles in A187800 and A228594. %e A228726 a(9) = 9 because there are 9 elements in the 9th rows of A187800 and A228594. %K A228726 nonn %O A228726 1,4 %A A228726 _Christopher Hunt Gribble_, Aug 31 2013