Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

A217342

Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

Terms

    a(0) =0a(1) =38a(2) =2389a(3) =120908a(4) =5756974a(5) =267947653a(6) =12350550690a(7) =566789163488

External references