Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
A221505
Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction.
Terms
- a(0) =0a(1) =44a(2) =664a(3) =12495a(4) =221614a(5) =4010052a(6) =72195950a(7) =1301644004a(8) =23457033692a(9) =422775316892
External references
- oeis: A221505