2869242domain: NAppears in sequencesNumber of ways of placing n labeled balls into n unlabeled (but 6-colored) boxes.at n=7A144223a(n) = (1/e^n)*Sum_{j >= 1} j^n * n^j / (j-1)!.at n=5A299824Triangle read by rows. T(n, k) = BellPolynomial(n, k).at n=34A350256