Number of n X 3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor.
A221721
Number of n X 3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor.
Terms
- a(0) =8a(1) =318a(2) =11733a(3) =429160a(4) =15672482a(5) =572137641a(6) =20884488408a(7) =762319022830
External references
- oeis: A221721