Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
A252515
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
Terms
- a(0) =806a(1) =432a(2) =1783a(3) =5628a(4) =74181a(5) =1215491a(6) =6486931a(7) =304232630a(8) =16970081459a(9) =108911061618
External references
- oeis: A252515