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 A112336 #3 Mar 30 2012 18:59:12 %S A112336 1,2,2,6,4,4,20,12,8,8,70,40,24,16,16,252,140,80,48,32,32,924,504,280, %T A112336 160,96,64,64,3432,1848,1008,560,320,192,128,128,12870,6864,3696,2016, %U A112336 1120,640,384,256,256,48620,25740,13728,7392,4032,2240,1280,768,512,512 %N A112336 A number triangle related to the central binomial coefficients. %C A112336 Row sums are A082590. Diagonal sums are A106189. %F A112336 Number triangle T(n, k)=2^k*binomial(2(n-k), n-k); Column k has g.f. (2x)^k/sqrt(1-4x). %e A112336 Triangle begins %e A112336 1; %e A112336 2,2; %e A112336 6,4,4; %e A112336 20,12,8,8; %e A112336 70,40,24,16,16; %K A112336 easy,nonn,tabl %O A112336 0,2 %A A112336 _Paul Barry_, Sep 04 2005