A066314 Number of identity (asymmetric) bracelets (or necklaces) with n red or blue beads such that the beads switch colors when bracelet is turned over.

1, 0, 1, 1, 3, 3, 9, 12, 28, 42, 93, 154, 315, 549, 1091, 1980, 3855, 7140, 13797, 25941, 49929, 94767, 182361, 348430, 671088, 1288350, 2485504, 4789134, 9256395, 17886951, 34636833, 67091520, 130150493, 252610440, 490853403

Offset

1,5

Links

Table of n, a(n) for n=1..35.

Index entries for sequences related to bracelets

Formula

a(n)=A001037(n)-A066313(n).

Crossrefs

Sequence in context: A363129 A325243 A319271 * A083336 A225436 A183811

Adjacent sequences: A066311 A066312 A066313 * A066315 A066316 A066317

Keyword

nonn

Author

Christian G. Bower, Dec 13 2001

Status

approved