Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.
A221730
Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two.
Terms
- a(0) =0a(1) =44a(2) =464a(3) =6188a(4) =80160a(5) =1048566a(6) =13757056a(7) =180437354a(8) =2363318964a(9) =30930073844a(10) =404584067882
External references
- oeis: A221730