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

A210070

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

Terms

    a(0) =33a(1) =313a(2) =2908a(3) =27129a(4) =252951a(5) =2358878a(6) =21997263a(7) =205132657a(8) =1912938102a(9) =17838863745a(10) =166354085323

External references