1/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.

A209552

1/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.

Terms

    a(0) =6049a(1) =490547a(2) =35741496a(3) =2708892873a(4) =203828058161

External references