Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221815
Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =1a(1) =91a(2) =1041a(3) =29412a(4) =574706a(5) =13076919a(6) =280280821a(7) =6157362467a(8) =133971367251
External references
- oeis: A221815