Number of 4Xn 0..3 arrays with rows unimodal and columns nondecreasing.
A223989
Number of 4Xn 0..3 arrays with rows unimodal and columns nondecreasing.
Terms
- a(0) =35a(1) =1225a(2) =25410a(3) =358118a(4) =3770722a(5) =31585056a(6) =219861244a(7) =1312747586a(8) =6885325482a(9) =32313530946a(10) =137690265950a(11) =539018300034
External references
- oeis: A223989