1498824domain: NAppears in sequencesa(n) = (n-1)^3*((n-2)^2 - 2*(n-3)).at n=18A079503a(n) = 8*n^3*((2*n-1)^2 - 4*n + 4).at n=9A079504Number of tilings of a 2 X n rectangle using 2 X 2 and 1 X 1 tiles, right trominoes and dominoes.at n=10A354131