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

A224386

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

Terms

    a(0) =20a(1) =400a(2) =6094a(3) =86701a(4) =1268572a(5) =18794636a(6) =279128617a(7) =4142692993a(8) =61481903024a(9) =912523782542

External references