Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7.
A252449
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7.
Terms
- a(0) =661a(1) =334a(2) =3366a(3) =48170a(4) =1058050a(5) =36760486a(6) =1956458824a(7) =160517960252
External references
- oeis: A252449