Number of n-bead necklaces with 6 colors.

Terms

a(0) =1a(1) =6a(2) =21a(3) =76a(4) =336a(5) =1560a(6) =7826a(7) =39996a(8) =210126a(9) =1119796a(10) =6047412a(11) =32981556a(12) =181402676a(13) =1004668776a(14) =5597460306a(15) =31345666736a(16) =176319474366a(17) =995685849696