157025515248domain: NAppears in sequencesNumber of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=3A203818Number of (n+1) X 5 0..3 arrays with no 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=3A203822