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A066316 Number of identity (asymmetric) bracelets (or necklaces) with n red and blue beads such that the beads switch colors when bracelet is turned over. 1
1, 5, 24, 91, 340, 1224, 4365, 15521, 55311, 197964, 712243, 2577105, 9375360, 34284971, 125977464, 464938189, 1722817415, 6407307543, 23909159417, 89491715105, 335908316844, 1264097675775, 4768430557020, 18027183349395 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..27.

Index entries for sequences related to bracelets

FORMULA

a(n)=A022553(n)-A066315(n)

CROSSREFS

Sequence in context: A158499 A074085 A145914 * A271458 A301526 A180354

Adjacent sequences:  A066313 A066314 A066315 * A066317 A066318 A066319

KEYWORD

nonn

AUTHOR

Christian G. Bower, Dec 13 2001

STATUS

approved

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Last modified January 18 03:13 EST 2019. Contains 319260 sequences. (Running on oeis4.)