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 A026656 #4 Mar 30 2012 18:56:09 %S A026656 1,1,4,5,15,22,67,98,275,436,1249,1940,5244,8632,23896,38408,101419, %T A026656 170896,462361,760400,1975160,3383392,9001276,15054368,38623130, %U A026656 66984256,175903414,298045760,757228832,1326151552,3446259592 %N A026656 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026648. %K A026656 nonn %O A026656 0,3 %A A026656 _Clark Kimberling_