36557domain: NAppears in sequencesNumber of n-bead necklaces labeled with numbers 1..7 allowing reversal, with no adjacent beads differing by more than 1.at n=12A208720p-INVERT of the (4^n), where p(S) = 1 - S - S^2.at n=6A289784Numbers k such that k![4] - 8 is prime, where k![4] = A007662(k) = quadruple factorial.at n=32A329112