16711423domain: NAppears in sequencesa(n) = Sum_{d|n} (-1)^(n/d+1)*d^n.at n=7A321438a(n) = Sum_{d|n} (-1)^(n/d+1)*d^8.at n=7A321553a(n) = Sum_{k=1..n} mu(k) * floor(n/k)^n.at n=7A332468