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 A023556 #3 Mar 30 2012 18:55:52 %S A023556 0,1,0,1,2,0,2,2,2,1,3,3,1,4,2,4,3,2,4,5,3,3,5,3,5,5,5,2,6,6,4,6,4,6, %T A023556 5,5,7,7,4,5,7,7,5,8,6,6,8,4,8,8,8,6,7,7,7,9,7,7,9,9,7,7,7,9,10,8,8, %U A023556 10,7,8,10,10,6,10,10,10,11,5,11,9,9,11,11,9,9,11,10,9,11,10 %N A023556 Convolution of A023531 and A023532. %K A023556 nonn %O A023556 1,5 %A A023556 _Clark Kimberling_