Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum 3 or 6 and every diagonal and antidiagonal sum not 3 or 6.
A251771
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum 3 or 6 and every diagonal and antidiagonal sum not 3 or 6.
Terms
- a(0) =470a(1) =4182a(2) =43778a(3) =524774a(4) =39849294a(5) =1752287522a(6) =63113882510
External references
- oeis: A251771