65779domain: NAppears in sequencesNumber of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= sqrt(n).at n=25A048093a(n) = binomial(n+6,5) - 1.at n=20A062988a(n) = floor(Product_{i=1..n} log(prime(i+1))/log(i+1)).at n=30A089223Expansion of e.g.f. 1 / (2 - exp(-x) / (1 - x)).at n=8A328007