-22679domain: ZAppears in sequencesCoefficients of polynomials based on the generalized factorial at k=2 (A001147): b(n)=b(n-1+k; a(n)=b(n)*a(n-1); p(x,n)=If[n == 0, 1, a(n - 1)*(x - a(n - 1))*Product[x + 1/b(i), {i, 1, n - 1}]].at n=16A144457Expansion of e.g.f. exp(x * (1 + x^4)^(3/4)).at n=9A373526