1/4 the number of (n+1)X4 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.

A210072

1/4 the number of (n+1)X4 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.

Terms

    a(0) =2908a(1) =183628a(2) =11333893a(3) =707627792a(4) =44179487805

External references