Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.
A221331
Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.
Terms
- a(0) =1a(1) =577a(2) =33873a(3) =2460824a(4) =162430981a(5) =10794156688a(6) =711858713069
External references
- oeis: A221331