Number of n-bead necklaces with 5 colors.

Terms

a(0) =1a(1) =5a(2) =15a(3) =45a(4) =165a(5) =629a(6) =2635a(7) =11165a(8) =48915a(9) =217045a(10) =976887a(11) =4438925a(12) =20346485a(13) =93900245a(14) =435970995a(15) =2034505661a(16) =9536767665a(17) =44878791365a(18) =211927736135