184500domain: NAppears in sequencesNumber of 2n-bead black-white strings with n black beads and fundamental period 2n.at n=10A007727Number of 2n-bead balanced binary necklaces of fundamental period 2n equivalent to reverse.at n=20A045680Moebius transform of A001405 (binomial(n, floor(n/2))).at n=19A062791