Number of n-bead necklaces of 7 colors allowing reversal, with no adjacent beads having the same color.
A208543
Number of n-bead necklaces of 7 colors allowing reversal, with no adjacent beads having the same color.
Terms
- a(0) =7a(1) =21a(2) =35a(3) =231a(4) =777a(5) =4291a(6) =19995a(7) =107331a(8) =559895a(9) =3037314a(10) =16490775a(11) =90782986a(12) =502334385a(13) =2799220041a(14) =15672833365a(15) =88162676511a(16) =497842924845
External references
- oeis: A208543