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

A252220

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

Terms

    a(0) =228a(1) =1028a(2) =9566a(3) =58334a(4) =412514a(5) =4329476a(6) =44099648a(7) =415405634a(8) =3886445124a(9) =36834748542a(10) =350195757374

External references