Number of n-bead bracelet structures using exactly two different colored beads that are not self-equivalent under either a nonzero rotation or reversal (turning over bracelet).

A327734

Number of n-bead bracelet structures using exactly two different colored beads that are not self-equivalent under either a nonzero rotation or reversal (turning over bracelet).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =7a(9) =12a(10) =31a(11) =57a(12) =126a(13) =232a(14) =484a(15) =900a(16) =1800a(17) =3388a(18) =6643a(19) =12594a(20) =24457a(21) =46624a(22) =90157a(23) =172680a(24) =333498a(25) =641088a(26) =1238664a(27) =2388357a(28) =4620006a(29) =8931052

External references