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

A206312

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

Terms

    a(0) =873a(1) =14990a(2) =258452a(3) =4466450a(4) =77132181a(5) =1332632711a(6) =23019152735a(7) =397663246671

External references