5864750domain: NAppears in sequencesNumber of necklaces with 11 black beads and n-11 white beads.at n=22A032196a(n) = (1/(3*n))*Sum_{d|n, d even} phi(2*n/d)*binomial(3d/2,d).at n=11A082936(1/3) times the number of n-member subsets of [3n] whose elements sum to a multiple of n.at n=10A309182