82187658domain: NAppears in sequencesNumber of ways of placing n labeled balls into n unlabeled (but7-colored) boxes.at n=8A144263a(n) = (1/e^n)*Sum_{j >= 1} j^n * n^j / (j-1)!.at n=6A299824Triangle read by rows. T(n, k) = BellPolynomial(n, k).at n=43A350256