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

A210328

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

Terms

    a(0) =39a(1) =406a(2) =4200a(3) =43519a(4) =450903a(5) =4672093a(6) =48410727a(7) =501617911a(8) =5197622367a(9) =53856299887a(10) =558043855647

External references