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 5 6 or 7.
A252193
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 5 6 or 7.
Terms
- a(0) =441a(1) =470a(2) =1647a(3) =21928a(4) =480526a(5) =16789626a(6) =896763106a(7) =73759241737
External references
- oeis: A252193