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 A128083 #3 Mar 30 2012 18:37:03
%S A128083 1,1,3,37,1159,66953,6158021,825889193,152147002939,36866098462221,
%T A128083 11368538145120143,4347671960639941039,2019396728684584627337,
%U A128083 1119792551093682455434255,730724550040451849614251167
%N A128083 Sum of squared coefficients of q in the q-analog of the odd double factorials.
%o A128083 (PARI) {a(n)=if(n==0,1,sum(k=0,n^2,polcoeff(prod(j=1,n,(1-q^(2*j-1))/(1-q)),k,q)^2))}
%Y A128083 Cf. A001147 ((2n-1)!!); A128080 (triangle), A128081 (central terms), A128082 (diagonal); A127728, A128087.
%K A128083 nonn
%O A128083 0,3
%A A128083 _Paul D. Hanna_, Feb 14 2007