12204240domain: NAppears in sequencesNumber of 7-bead necklaces of n colors allowing reversal, with no adjacent beads having the same color.at n=15A208545a(n) = n^6 + n^5 + n^4 + n^3 + n^2 + n.at n=15A228290Numbers k such that k = Sum_{i=1..j} Sd(k)^i, for some j>0, where Sd(k) is the sum of the digits of k.at n=32A286126