Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

A221823

Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.

Terms

    a(0) =13a(1) =2113a(2) =190756a(3) =18636989a(4) =1804472268a(5) =174820457922

External references