3181482

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= n/3.at n=26A047198
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+1)/3.at n=26A048043
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+2)/3.at n=26A048076