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 A023555 #3 Mar 30 2012 18:55:52 %S A023555 0,0,1,0,0,2,0,0,1,2,0,0,2,0,2,0,1,2,0,0,2,2,0,2,0,0,1,4,0,0,2,0,2,0, %T A023555 2,2,0,0,3,2,0,0,2,0,2,2,0,4,0,0,0,2,1,2,2,0,2,2,0,0,2,2,2,0,0,2,2,0, %U A023555 3,2,0,0,4,0,0,0,0,6,0,2,2,0,0,2,2,0,1,2,0,2 %N A023555 Self-convolution of A023531. %K A023555 nonn %O A023555 1,6 %A A023555 _Clark Kimberling_