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

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.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =3a(6) =9a(7) =12a(8) =28a(9) =42a(10) =93a(11) =154a(12) =315a(13) =549a(14) =1091a(15) =1980a(16) =3855a(17) =7140a(18) =13797a(19) =25941a(20) =49929a(21) =94767a(22) =182361a(23) =348430a(24) =671088a(25) =1288350a(26) =2485504a(27) =4789134a(28) =9256395a(29) =17886951

External references