17175674880domain: NAppears in sequencesa(n) = 4^(n-1)*(2^n-1).at n=12A016152a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 13.at n=7A160972a(n) = 2^n - 2^floor(2n/3).at n=34A291779