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 A026575 #4 Mar 30 2012 18:56:09 %S A026575 1,2,12,38,200,701,3682,13294,70665,258430,1388002,5114572,27682135, %T A026575 102539204,558172494,2075658454,11348521989,42330184638 %N A026575 T(2n,n-1), T given by A026568. %K A026575 nonn %O A026575 1,2 %A A026575 _Clark Kimberling_