Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor.

A220939

Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor.

Terms

    a(0) =1a(1) =20a(2) =208a(3) =2056a(4) =20483a(5) =203905a(6) =2029453a(7) =20199560a(8) =201050056a(9) =2001087460a(10) =19917184799a(11) =198239333473

External references