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 A023561 #3 Mar 30 2012 18:55:52 %S A023561 0,1,2,3,6,10,16,26,43,70,113,183,296,480,777,1257,2034,3291,5325, %T A023561 8617,13943,22560,36503,59063,95566,154629,250196,404826,655022, %U A023561 1059848,1714870,2774718,4489588,7264306 %N A023561 Convolution of A023531 and (F(2), F(3), F(4), ...). %K A023561 nonn %O A023561 1,3 %A A023561 _Clark Kimberling_