Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
A252209
Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =278710a(1) =2568954a(2) =65275092a(3) =301990806a(4) =10519316686a(5) =267361717782
External references
- oeis: A252209