Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
A207275
Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =4a(1) =256a(2) =121014a(3) =553738958
External references
- oeis: A207275