Number of (n+1) X 2 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two equal edges, and new values 0..3 introduced in row major order.

A206231

Number of (n+1) X 2 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two equal edges, and new values 0..3 introduced in row major order.

Terms

    a(0) =15a(1) =60a(2) =310a(3) =1640a(4) =8910a(5) =51066a(6) =294546a(7) =1710184a(8) =10051522a(9) =59273370a(10) =350336326a(11) =2076929912a(12) =12328636710a(13) =73241168202a(14) =435453806538

External references