5779200domain: NAppears in sequencesNumber of different fixed (possibly) disconnected pentominoes bounded tightly by an n X n square.at n=11A163435Triangle T_3(n, m), the number of surjective multi-valued functions from {1, 1, 1, 2, 3, ..., n-2} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).at n=52A172107