Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal or vertical neighbors.
A264952
Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal or vertical neighbors.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =504a(4) =22320a(5) =1521360a(6) =140394240a(7) =17034433920
External references
- oeis: A264952