1180281domain: NAppears in sequencesG.f.: A(x) = Sum_{n>=0} x^n / Product_{k=1..n} (1-x^k)^k.at n=31A206100O.g.f.: Sum_{n>=0} n!^2 * x^n * Product_{k=1..n} (1 + x) / (1 + k^2*x + k^2*x^2).at n=7A221371