265600domain: NAppears in sequencesa(n) = (n^n mod n!)/n.at n=9A211341Number of (3+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=16A252535