13298557992domain: NAppears in sequencesTriangle read by rows: T(k,n) (k >= 0, n = 0, ..., k) = number of tilings of a k X n rectangle using 2 X 2 tiles, right trominoes and dominoes.at n=35A354010Number of tilings of an n X n square using right trominoes, dominoes, and 2 X 2 tiles.at n=7A354119