Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using a maximum of four different colored beads.

A328658

Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using a maximum of four different colored beads.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =6a(5) =19a(6) =58a(7) =195a(8) =651a(9) =2294a(10) =8122a(11) =29607a(12) =108276a(13) =401389a(14) =1494268a(15) =5600204a(16) =21065520a(17) =79567572a(18) =301448098a(19) =1145448216a(20) =4363328350a(21) =16659757647a(22) =63740548126a(23) =244337865925a(24) =938252884294

External references