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

A210406

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

Terms

    a(0) =7a(1) =78a(2) =864a(3) =9576a(4) =106128a(5) =1176192a(6) =13035456a(7) =144468864a(8) =1601114112a(9) =17744767488a(10) =196661044224

External references