Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
A221506
Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
Terms
- a(0) =1a(1) =446a(2) =31663a(3) =2691211a(4) =219689604a(5) =18054912942
External references
- oeis: A221506