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 A023566 #3 Mar 30 2012 18:55:52 %S A023566 0,0,1,1,0,2,2,1,2,3,2,2,3,2,4,4,3,3,4,4,4,5,3,4,5,5,5,5,5,5,6,6,5,6, %T A023566 6,5,7,6,5,7,7,7,6,6,8,7,7,7,8,8,8,8,7,6,9,9,7,9,9,8,8,9,7,8,9,10,10, %U A023566 9,8,10,10,10,9,9,9,10,10,10,11,10,11,10,11,10,10,10,11,9,11,10 %N A023566 Convolution of A023531 and A014306. %K A023566 nonn %O A023566 1,6 %A A023566 _Clark Kimberling_