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

A056370

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =3a(7) =27a(8) =171a(9) =1249a(10) =8389a(11) =56078a(12) =360430a(13) =2272598a(14) =14037552a(15) =85516427a(16) =514976658a(17) =3074986236a(18) =18239677629a(19) =107654218055a(20) =632996894925

External references