A066315 Number of aperiodic bracelets (or necklaces) with n red and blue beads such that the beads switch colors when bracelet is turned over.

1, 1, 3, 7, 20, 51, 154, 460, 1476, 4860, 16544, 57321, 202059, 720370, 2593470, 9408000, 34350506, 126108252, 465200332, 1723341185, 6408356052, 23911255544, 89495909408, 335916703284, 1264114452975, 4768464107355

Offset: 1

Author

Christian G. Bower, Dec 13 2001

Keywords

• nonn

Links

• Index entries for sequences related to bracelets

Programs

Mathematica

a[n_] := Sum[MoebiusMu[n/d] A006080[d + 1], {d, Divisors[n]}];
Array[a, 26] (* Jean-François Alcover, Aug 28 2019 *)

Formula

Moebius transform of A006080(n+1).