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A066315 Number of aperiodic bracelets (or necklaces) with n red and blue beads such that the beads switch colors when bracelet is turned over. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
FORMULA
Moebius transform of A006080(n+1).
MATHEMATICA
a[n_] := Sum[MoebiusMu[n/d] A006080[d + 1], {d, Divisors[n]}];
Array[a, 26] (* Jean-François Alcover, Aug 28 2019 *)
CROSSREFS
Sequence in context: A281971 A230352 A271894 * A339061 A058499 A003097
KEYWORD
nonn
AUTHOR
Christian G. Bower, Dec 13 2001
STATUS
approved

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Last modified March 29 11:45 EDT 2024. Contains 371278 sequences. (Running on oeis4.)