50487domain: NAppears in sequencesCumulative sum of double primorials (A079078).at n=9A114410G.f. A(x) satisfies A(x) = 1 + Sum_{n>=1} A(x)^n * x^(2*n-1)/(1 - x^(2*n-1)).at n=13A192400Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=19A192951