a(n) = [x^n] Product_{k>=1} 1/(1 - n^2*x^k).

A292417

a(n) = [x^n] Product_{k>=1} 1/(1 - n^2*x^k).

Terms

    a(0) =1a(1) =1a(2) =20a(3) =819a(4) =70160a(5) =10188775a(6) =2240751636a(7) =692647082799

External references