3175696domain: NAppears in sequencesArray read by antidiagonals: T(n,m) is the number of matchings in the rook graph K_n X K_m.at n=30A270227Array read by antidiagonals: T(n,m) is the number of matchings in the rook graph K_n X K_m.at n=33A270227Number of matchings in the 3 X n rook graph.at n=6A341502