Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops.
A221237
Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops.
Terms
- a(0) =0a(1) =53a(2) =1979a(3) =67710a(4) =2217402a(5) =71862107a(6) =2319920239a(7) =74798189113
External references
- oeis: A221237