Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor.
A221241
Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor.
Terms
- a(0) =2a(1) =50a(2) =1056a(3) =21660a(4) =441720a(5) =8997120a(6) =183206016a(7) =3730330800a(8) =75953515968
External references
- oeis: A221241