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 A202148 #9 Mar 31 2012 10:32:27
%S A202148 1,2,4,8,12,32,36,100,132,392,384,1168,1500,5332,5284,15740,16804,
%T A202148 60896,62872,222948,243780,927176,876004,2999432,3284180,12706832,
%U A202148 12636656,45043700,46679920,176783132,177597976,652158968,700632804,2696835032,2735898216
%N A202148 Sum of rows of the triangle in A080381.
%e A202148 a(0)= 1.
%e A202148 a(4)= 1 + 2 + 6 + 2 + 1 = 12.
%t A202148 Table[Total[Table[GCD[Binomial[n, j], Binomial[n, Floor[n/2]]], {j, 0, n}]], {n, 0, 50}]
%Y A202148 Cf. A080381.
%K A202148 nonn
%O A202148 0,2
%A A202148 _Jacques ALARDET_, Dec 12 2011