Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction.
A221872
Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction.
Terms
- a(0) =1a(1) =1442a(2) =109441a(3) =14388224a(4) =1572414124a(5) =180850094177
External references
- oeis: A221872