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, 5, 24, 91, 340, 1224, 4365, 15521, 55311, 197964, 712243, 2577105, 9375360, 34284971, 125977464, 464938189, 1722817415, 6407307543, 23909159417, 89491715105, 335908316844, 1264097675775, 4768430557020, 18027183349395

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