Number of n X 4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.
A221197
Number of n X 4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.
Terms
- a(0) =4a(1) =196a(2) =9025a(3) =427716a(4) =20277009a(5) =961434049a(6) =45583531009
External references
- oeis: A221197