Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6.
A251821
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6.
Terms
- a(0) =1890a(1) =8674a(2) =130826a(3) =1692106a(4) =101716526a(5) =12583469514a(6) =395032012018
External references
- oeis: A251821