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

A328038

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

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =8a(6) =25a(7) =62a(8) =176a(9) =470a(10) =1311a(11) =3620a(12) =10094a(13) =28209a(14) =79236a(15) =223270a(16) =631240a(17) =1790213a(18) =5090995a(19) =14515788a(20) =41484907a(21) =118821599a(22) =341008317a(23) =980487770a(24) =2823961866a(25) =8146372122a(26) =23534556225a(27) =68083326558a(28) =197209108054a(29) =571910949743

External references