Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.
A209788
Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.
Terms
- a(0) =30a(1) =3171a(2) =1732554a(3) =4953638163
External references
- oeis: A209788