Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.

A206121

Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.

Terms

    a(0) =50a(1) =170a(2) =558a(3) =1906a(4) =6386a(5) =21940a(6) =74714a(7) =258496a(8) =891586a(9) =3106540a(10) =10821426a(11) =37946232a(12) =133190826a(13) =469570860a(14) =1657721338a(15) =5869905680a(16) =20812541098a(17) =73947974244a(18) =263041695362a(19) =937043382992

External references