141981480530domain: NAppears in sequencesG.f. A(x) satisfies: 1 = Sum_{n>=0} (-1)^n * (n+1) * x^(n*(n+1)/2) * A(x)^(n+1) /( Product_{k=1..n+1} 1 - x^k*A(x) ).at n=18A338185