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 A125809 #3 Mar 30 2012 18:37:02
%S A125809 1,2,4,8,18,44,120,348,1064,3368,10952,36336,122570,419104,1449672,
%T A125809 5064240,17844558,63356072,226459120,814323856,2944055592,10695723368,
%U A125809 39029679176,142998497292,525862368660,1940381764088,7182278240848
%N A125809 Row sums of triangle A125806.
%C A125809 Triangle A125806 gives the sum of squared coefficients of q in the corresponding q-binomial coefficients.
%o A125809 (PARI) {a(n)=sum(k=0,n,sum(i=0,(n-k)*k, polcoeff(if(n==0,1,prod(j=n-k+1,n,1-q^j)/prod(j=1,k,1-q^j)),i)^2))}
%Y A125809 Cf. A125806 (triangle); A063075, A125807, A125808.
%K A125809 nonn
%O A125809 0,2
%A A125809 _Paul D. Hanna_, Dec 12 2006