Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.
A221133
Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.
Terms
- a(0) =0a(1) =9a(2) =656a(3) =643204a(4) =4235650596
External references
- oeis: A221133