Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221901
Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =13a(1) =2305a(2) =235332a(3) =25821731a(4) =2815434576a(5) =307126807101
External references
- oeis: A221901