Number of pairs of orientable necklaces with n beads and up to 6 colors; i.e., turning the necklace over does not leave it unchanged. The turned-over necklace is not included in the count.
A278642
Number of pairs of orientable necklaces with n beads and up to 6 colors; i.e., turning the necklace over does not leave it unchanged. The turned-over necklace is not included in the count.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =20a(4) =105a(5) =672a(6) =3535a(7) =19350a(8) =102795a(9) =556010a(10) =3010098a(11) =16467450a(12) =90619690a(13) =502194420a(14) =2798240265a(15) =15671993560a(16) =88156797855a(17) =497837886000
External references
- oeis: A278642