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

A206311

Number of (n+1)X2 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) =112a(1) =873a(2) =6831a(3) =53463a(4) =418468a(5) =3275406a(6) =25637095a(7) =200665376a(8) =1570637751a(9) =12293615779a(10) =96223962193a(11) =753159288558

External references