19546906987domain: NAppears in sequencesTriangle read by rows: T(n,k) = number of tilings of a n X k rectangle using right trominoes, dominoes and 1 X 1 tiles, n >= 0, k = 0..n.at n=40A353877Number of tilings of a 4 X n rectangle using right trominoes, dominoes and 1 X 1 tiles.at n=8A353879