Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor.
A220999
Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor.
Terms
- a(0) =21a(1) =2989a(2) =394580a(3) =51672851a(4) =6758547145a(5) =883809591160
External references
- oeis: A220999