1010580544domain: NAppears in sequencesNumber of n-bead necklaces with 4 colors.at n=17A001868Number of subsets of {1,2,3,...,n} that sum to 0 mod 17.at n=34A068038a(n) = -(1/n) * Sum_{d|n} phi(n/d) * (-4)^d.at n=16A343466