Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.

A209779

Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.

Terms

    a(0) =64a(1) =12492a(2) =13606964a(3) =89046135210

External references