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

A252429

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

Terms

    a(0) =1693a(1) =1488a(2) =2971a(3) =7575a(4) =20187a(5) =53028a(6) =139425a(7) =374789a(8) =987296a(9) =2598603a(10) =6980876a(11) =18418693a(12) =48445791a(13) =130135991a(14) =343594820a(15) =903608172a(16) =2427038718a(17) =6410968020a(18) =16858590226a(19) =45274217595a(20) =119646835494a(21) =314596556735a(22) =844728863140

External references