Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two.

A221395

Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two.

Terms

    a(0) =4a(1) =54a(2) =631a(3) =7678a(4) =93398a(5) =1137850a(6) =13857444a(7) =168717375a(8) =2053766992a(9) =24997337148a(10) =304235229651

External references