1148928domain: NAppears in sequencesa(n) = n*(n-1)*(n-2)^2.at n=32A047927Number of (n+2) X (4+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=18A252110