1221889domain: 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=37A270227Array read by antidiagonals: T(n,m) is the number of matchings in the rook graph K_n X K_m.at n=43A270227Number of matchings in the 2 X n rook graph P_2 X K_n.at n=8A270229