Number of nX7 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns.
A221786
Number of nX7 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns.
Terms
- a(0) =0a(1) =55a(2) =840a(3) =15936a(4) =252538a(5) =4781652a(6) =76353254a(7) =1402260000a(8) =23429257696
External references
- oeis: A221786