243678domain: NAppears in sequencesNumber of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and three times sum of squares <= n^2*(n+1).at n=6A208797Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1).at n=6A208804