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

A210332

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

Terms

    a(0) =450903a(1) =293095459a(2) =184424586007

External references