Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

A223912

Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

Terms

    a(0) =3a(1) =36a(2) =666a(3) =14123a(4) =319156a(5) =7526024a(6) =183720802a(7) =4620831232a(8) =119279565646

External references