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 A026089 #4 Mar 30 2012 18:56:04 %S A026089 1,2,4,16,93,518,2932,16709,95849,552749,3201848,18616751,108592239, %T A026089 635175153,3724193120,21881993115,128810517855,759515272026, %U A026089 4485048436792,26520334731436,157006248094198 %N A026089 a(n) = T(2n,n), where T is the array defined in A026082. %Y A026089 Bisection of A026094. %K A026089 nonn %O A026089 0,2 %A A026089 _Clark Kimberling_