45232115901domain: NAppears in sequencesStirling numbers of the second kind, S(n,4).at n=16A000453Stirling numbers of second kind S2(20,n).at n=3A011569O.g.f.: Sum_{n>=1} (n^5)^n * exp(-n^5*x) * x^n / n!.at n=4A217915a(n) = Stirling2(n^2+n, n).at n=4A218142