245366784domain: NAppears in sequencesa(n) = 2^(n-3)*(n + 3)*(2*n - 3).at n=18A059224Number of (n+1) X (n+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=19A253461