348127232domain: NAppears in sequencesNumber of subsets of {1,.., n} containing at least one twin prime pair.at n=28A089828Expansion of g.f. (1 - x)^2*(1 + x) / (1 - 2*x)^2.at n=25A106472a(n) = 2^(n-1) * prime(n).at n=22A110295Numbers with 46 divisors.at n=21A175753