474000090118domain: NAppears in sequencesa(n) = coefficient of x^n in A(x) = Sum_{n>=0} x^n*F(x)^n * (1 - x^n*F(x)^n)^n, where F(x) = 1 + x*F(x)^3 is a g.f. of A001764.at n=18A357793