104717491064
domain: N
Appears in sequences
- Number of bracelets (turnover necklaces) of n beads of 4 colors.at n=20A032275
- Consider necklaces with n beads, each black or white, where the n segments of cord between the beads are each colored red or green; a(n) is the number of different necklaces under the action of the dihedral group D_{2n}.at n=21A161221