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 A128087 #3 Mar 30 2012 18:37:03
%S A128087 1,2,14,296,12938,956720,107245250,16966970200,3601980861720,
%T A128087 988252809411908,340375635448973106,143798619953044471444,
%U A128087 73123320014581106403732,44060303354020797873285800
%N A128087 Sum of squared coefficients of q in the q-analog of the even double factorials.
%C A128087 See A128083 for sum of squared coefficients of q in the q-analog of the odd double factorials. Also, A127728 is the sum of squared coefficients of q in the q-factorials.
%o A128087 (PARI) {a(n)=if(n==0,1,sum(k=0,n^2,polcoeff(prod(j=1,n,(1-q^(2*j))/(1-q)),k,q)^2))}
%Y A128087 Cf. A000165 ((2n)!!); A128084 (triangle), A128085 (central terms), A128086 (diagonal); A127728.
%K A128087 nonn
%O A128087 0,2
%A A128087 _Paul D. Hanna_, Feb 14 2007