4648124656domain: NAppears in sequencesNumber of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=6A203790Number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=1A203795