270529

Appears in sequences

• Array read by antidiagonals: T(n,m) is the number of matchings in the rook graph K_n X K_m.at n=24A270227
• Number of matchings in the n X n rook graph K_n X K_n.at n=3A270228
• Number of matchings in the 4 X n rook graph.at n=4A341503