1/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.

A210074

1/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.

Terms

    a(0) =252951a(1) =107248254a(2) =44179487805

External references