941977domain: NAppears in sequencesE.g.f. is series reversion of log(1+x)*exp(-x).at n=7A052888a(n) = numerator of (1/e)^n * Sum_{k>=0}(n^k*k^n)/(n!*k!).at n=7A339401Triangle read by rows: T(n,k) is the number of forests of labeled rooted Greg hypertrees with n white vertices and k black vertices, 0 <= k < n.at n=21A370949