Number of 2 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.
A221256
Number of 2 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.
Terms
- a(0) =0a(1) =4a(2) =8a(3) =81a(4) =392a(5) =2500a(6) =14112a(7) =83521a(8) =484128a(9) =2829124a(10) =16473800a(11) =96059601a(12) =559785800a(13) =3262922884a(14) =19017180288a(15) =110841719041a(16) =646029804672
External references
- oeis: A221256