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 A026916 #4 Mar 30 2012 18:56:11 %S A026916 1,13,72,136,419,700,1851,3028,7564,12412,30209,50020,119942,200524, %T A026916 475853,802612,1888976,3211036,7504737,12844804,29838451,51379948, %U A026916 118713767,205520596,472568449,822083260,1882043403 %N A026916 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026907. %K A026916 nonn %O A026916 0,2 %A A026916 _Clark Kimberling_