Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.
A221658
Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.
Terms
- a(0) =0a(1) =40a(2) =2594a(3) =233781a(4) =17254611a(5) =1312503181a(6) =99007036296
External references
- oeis: A221658