2810694domain: NAppears in sequencesNumber of monomer-dimer tilings of n X n chessboard.at n=5A028420Number of matchings in graph P_{5} X P_{n}.at n=5A033508Number of matchings in graph P_{5} X P_{5} X P_{n}.at n=1A033534Triangle read by rows: T(n,k) (1 <= k <= n) = number of monomer-dimer tilings of an n X k board.at n=14A210662