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

A066315

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =7a(4) =20a(5) =51a(6) =154a(7) =460a(8) =1476a(9) =4860a(10) =16544a(11) =57321a(12) =202059a(13) =720370a(14) =2593470a(15) =9408000a(16) =34350506a(17) =126108252a(18) =465200332a(19) =1723341185a(20) =6408356052a(21) =23911255544a(22) =89495909408a(23) =335916703284

External references