Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.
A221831
Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.
Terms
- a(0) =0a(1) =64a(2) =2930a(3) =115417a(4) =4715043a(5) =192788993a(6) =7888216533a(7) =322723834959
External references
- oeis: A221831