Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.
A207007
Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.
Terms
- a(0) =3a(1) =81a(2) =7891a(3) =5174065a(4) =18649387825
External references
- oeis: A207007