Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.
A209943
Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference.
Terms
- a(0) =34a(1) =4975a(2) =4681176a(3) =28414622976
External references
- oeis: A209943