Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
A221854
Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
Terms
- a(0) =1a(1) =306a(2) =10085a(3) =465305a(4) =19159028a(5) =811781250a(6) =34109464173
External references
- oeis: A221854