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

A210330

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

Terms

    a(0) =4200a(1) =344659a(2) =27838382a(3) =2266459861a(4) =184424586007

External references