Number of n X 4 arrays containing 4 indistinguishable copies of 1..n with lexicographical ordering of rows strictly increasing and columns strictly decreasing.
A180842
Number of n X 4 arrays containing 4 indistinguishable copies of 1..n with lexicographical ordering of rows strictly increasing and columns strictly decreasing.
Terms
- a(0) =1a(1) =0a(2) =44a(3) =14284a(4) =8554238a(5) =9893281255
External references
- oeis: A180842