186945

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= n/2.at n=21A047166
• Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= n/2.at n=21A047167
• Number of 8-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=26A186984