Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor.
A221164
Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor.
Terms
- a(0) =21a(1) =3721a(2) =609961a(3) =98570764a(4) =15891102336
External references
- oeis: A221164