Number of primitive (period n) bracelet structures using exactly three different colored beads.

A056367

Number of primitive (period n) bracelet structures using exactly three different colored beads.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =13a(6) =31a(7) =80a(8) =201a(9) =533a(10) =1401a(11) =3822a(12) =10395a(13) =28859a(14) =80201a(15) =225286a(16) =634265a(17) =1796433a(18) =5100325a(19) =14534758a(20) =41513402a(21) =118879249a(22) =341094843a(23) =980661980a(24) =2824223490a(25) =8146897815a(26) =23535345170

External references