Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
A252639
Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =24852a(1) =121016a(2) =840655a(3) =4416767a(4) =39238223a(5) =285228944a(6) =1669555189a(7) =14996577319a(8) =109620130066a(9) =681798971770
External references
- oeis: A252639