Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having one or three distinct values, and new values 0..3 introduced in row major order.

A210397

Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having one or three distinct values, and new values 0..3 introduced in row major order.

Terms

    a(0) =7a(1) =59a(2) =549a(3) =5167a(4) =48689a(5) =458859a(6) =4324477a(7) =40755719a(8) =384099369a(9) =3619917187a(10) =34115652149a(11) =321520538079

External references