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 A026574 #4 Mar 30 2012 18:56:09 %S A026574 1,1,7,19,103,341,1809,6336,33899,121483,656199,2381512,12957809, %T A026574 47419503,259395664,954961034,5245001951,19397198595,106871608053 %N A026574 T(2n,n), T given by A026568. %K A026574 nonn %O A026574 0,3 %A A026574 _Clark Kimberling_