Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221807
Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =1a(1) =214a(2) =3906a(3) =197048a(4) =6328365a(5) =247277805a(6) =8830682187a(7) =328546555815
External references
- oeis: A221807