Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.

A252131

Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.

Terms

    a(0) =172a(1) =156a(2) =1535a(3) =22766a(4) =503968a(5) =17562129a(6) =937980660a(7) =77093723594

External references