Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.
A221231
Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2.
Terms
- a(0) =2a(1) =119a(2) =2372a(3) =54075a(4) =1211716a(5) =27341781a(6) =616856209a(7) =13916105891a(8) =313875248748
External references
- oeis: A221231