9893281255

Appears in sequences

• Number of n X 4 arrays containing 4 indistinguishable copies of 1..n with lexicographical ordering of rows strictly increasing and columns strictly decreasing.at n=5A180842
• T(n,k)=number of nXk arrays containing k indistinguishable copies of 1..n with lexicographical ordering of rows strictly increasing and columns strictly decreasing.at n=41A180843