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

A210352

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

Terms

    a(0) =530580a(1) =416960476a(2) =320128196268

External references