Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
A252270
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
Terms
- a(0) =206a(1) =300a(2) =1407a(3) =4895a(4) =67509a(5) =1181875a(6) =5767680a(7) =279737770a(8) =16717863291a(9) =96797935205
External references
- oeis: A252270