Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4.

A252285

Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4.

Terms

    a(0) =564a(1) =1920a(2) =8208a(3) =68320a(4) =1227461a(5) =41069194a(6) =2178722578a(7) =178658210404

External references