Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero.

A205920

Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero.

Terms

    a(0) =389a(1) =2684a(2) =15561a(3) =104311a(4) =625713a(5) =4085161a(6) =25017018a(7) =160810946a(8) =996539188a(9) =6349065953a(10) =39612347102a(11) =251092937558

External references