7472984

Appears in sequences

• Number of ways to color vertices of a 9-gon using <= n colors, allowing rotations and reflections.at n=8A060561
• Triangle T(n,k) read by rows, giving number of bracelets (turnover necklaces) with n beads of k colors (n >= 1, 1 <= k <= n).at n=43A081720
• Consider necklaces with n beads, each of one of four colors (say C1, C2, C3, C4), 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=9A161222