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

A252336

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

Terms

    a(0) =52a(1) =108a(2) =234a(3) =538a(4) =1202a(5) =2612a(6) =5706a(7) =12616a(8) =27880a(9) =61330a(10) =134854a(11) =297006a(12) =654392a(13) =1441026a(14) =3172540a(15) =6985816a(16) =15384194a(17) =33877498a(18) =74597994a(19) =164266052a(20) =361723666a(21) =796536048a(22) =1754004560a(23) =3862386738a(24) =8505149742a(25) =18728734382a(26) =41241504360

External references