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 A023667 #3 Mar 30 2012 18:55:53 %S A023667 4,20,53,110,201,330,504,730,1013,1364,1787,2288,2880,3564,4348,5240, %T A023667 6243,7370,8624,10010,11540,13214,15045,17038,19196,21536,24056,26764, %U A023667 29671,32776,36095,39630,43384,47378,51605,56076,60801 %N A023667 Convolution of A001950 with itself. %K A023667 nonn %O A023667 1,1 %A A023667 _Clark Kimberling_