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 A225568 #10 Mar 12 2015 23:25:07 %S A225568 1,1,2,1,2,5,1,3,5,10,1,3,6,10,17,1,4,9,12,17,26,1,4,9,14,19,26,37,1, %T A225568 5,10,19,22,29,29,50 %N A225568 Number of entries in each row of the irregular triangles specified in A225777 and A225542. %e A225568 The 6th rows of A225777 and A225542, that is, when n = 3 and k = 3, both contain 5 entries, so a(6) = 5. %Y A225568 Cf. A225777, A225542. %K A225568 nonn %O A225568 1,3 %A A225568 _Christopher Hunt Gribble_, Jul 28 2013