Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221939
Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =1a(1) =91a(2) =1599a(3) =36467a(4) =799632a(5) =17595404a(6) =387146025a(7) =8517616158a(8) =187399250327
External references
- oeis: A221939