Number of nX4 0..2 arrays with antidiagonals unimodal.

A223572

Number of nX4 0..2 arrays with antidiagonals unimodal.

Terms

    a(0) =81a(1) =6561a(2) =352836a(3) =16230456a(4) =746600976a(5) =34343644896

External references