315679domain: NAppears in sequencesNumber of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= n/2.at n=28A047169Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-1)/2.at n=28A047180When A032523 is a maximum; or, A091657 less duplicates.at n=27A091658