273808domain: NAppears in sequencesNumber of tilings of a 3 X 3 X n box using 3n bricks of shape 3 X 1 X 1.at n=10A233289Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally, vertically, diagonally and antidiagonally.at n=8A253463