Number of n X 4 arrays of occupancy after each element moves to some horizontal or vertical neighbor.
A217269
Number of n X 4 arrays of occupancy after each element moves to some horizontal or vertical neighbor.
Terms
- a(0) =4a(1) =441a(2) =33856a(3) =2572816a(4) =194881600a(5) =14755689729
External references
- oeis: A217269