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

A056362

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =18a(7) =39a(8) =94a(9) =222a(10) =572a(11) =1463a(12) =3934a(13) =10584a(14) =29211a(15) =80808a(16) =226430a(17) =636320a(18) =1800318a(19) =5107479a(20) =14548360a(21) =41538874a(22) =118927919a(23) =341187047a(24) =980838750a(25) =2824561080a(26) =8147547156a(27) =23536592010a(28) =68087313892a(29) =197216119544

External references