Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor.
A220940
Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor.
Terms
- a(0) =2a(1) =208a(2) =7551a(3) =291080a(4) =11115933a(5) =424939090a(6) =16241930112a(7) =620799451653
External references
- oeis: A220940