1418514

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+1)/3.at n=25A048043
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+2)/3.at n=25A048076
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+3)/3.at n=25A048087