Number of nX3 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

A223956

Number of nX3 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

Terms

    a(0) =20a(1) =295a(2) =3471a(3) =41006a(4) =485714a(5) =5777663a(6) =68892600a(7) =822141033a(8) =9813968785a(9) =117159879996

External references