18087936domain: NAppears in sequencesExpansion of (1 - 2x + 2x^2 - x^3)/(1 - 2x)^2.at n=21A084860Numbers such that the sum of anti-divisors divides the concatenation (in ascending order) of anti-divisors.at n=27A308533(1/8) times the sum of the elements of all subsets of [n] whose sum is divisible by eight.at n=23A309300