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

A224276

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

Terms

    a(0) =50a(1) =984a(2) =13683a(3) =186516a(4) =2596992a(5) =37128051a(6) =537465766a(7) =7804602744a(8) =113382138975

External references