1573764
domain: N
Appears in sequences
- Number of nX2 arrays containing 2 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order.at n=7A180836
- T(n,k) = number of n X k arrays containing k indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order.at n=43A180839