Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
A207229
Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =3a(1) =81a(2) =5853a(3) =2464241a(4) =5437970705
External references
- oeis: A207229