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

A221727

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

Terms

    a(0) =4a(1) =52a(2) =540a(3) =6188a(4) =71310a(5) =824144a(6) =9525048a(7) =110070012a(8) =1271809066a(9) =14694217628a(10) =169767833676

External references