Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

A221427

Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

Terms

    a(0) =1a(1) =217a(2) =4390a(3) =194879a(4) =6688747a(5) =250167826a(6) =9077677881a(7) =333226472511

External references