Number of nX4 0..3 arrays with rows unimodal and columns nondecreasing.

A223983

Number of nX4 0..3 arrays with rows unimodal and columns nondecreasing.

Terms

    a(0) =130a(1) =3526a(2) =44803a(3) =358118a(4) =2086196a(5) =9647292a(6) =37395816a(7) =126087157a(8) =379654704a(9) =1040942916a(10) =2637614941a(11) =6248087300a(12) =13964013792a(13) =29662913488a(14) =60254807616a(15) =117633453657a(16) =221649696158a(17) =404535879938a(18) =717351048575

External references