240856

Appears in sequences

• Number of ways to place a non-attacking white and black queen on n X n chessboard.at n=22A035291
• Number of ways to place 3 nonattacking knights on an n X n cylindrical board.at n=10A172965
• Triangle read by rows, s_4(n, k) where s_m(n, k) are the Stirling-Frobenius cycle numbers of order m; n >= 0, k >= 0.at n=41A225471