1027072domain: NAppears in sequencesNumber of defective 4-colorings of an n X 2 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..3 order.at n=10A229749Number of tilings of a 10 X n rectangle using 2n pentominoes of shape L.at n=15A247120