Number of chiral pairs of necklaces with n beads and two colors (color complements being equivalent); i.e., turning the necklace over neither leaves it unchanged nor simply swaps the colors.

A059053

Number of chiral pairs of necklaces with n beads and two colors (color complements being equivalent); i.e., turning the necklace over neither leaves it unchanged nor simply swaps the colors.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =2a(9) =7a(10) =12a(11) =31a(12) =58a(13) =126a(14) =234a(15) =484a(16) =906a(17) =1800a(18) =3402a(19) =6643a(20) =12624a(21) =24458a(22) =46686a(23) =90157a(24) =172810a(25) =333498a(26) =641340a(27) =1238671a(28) =2388852a(29) =4620006

External references