Number of aperiodic necklaces (Lyndon words) with 9 black beads and n white beads.

Terms

a(0) =0a(1) =1a(2) =5a(3) =18a(4) =55a(5) =143a(6) =333a(7) =715a(8) =1430a(9) =2700a(10) =4862a(11) =8398a(12) =13995a(13) =22610a(14) =35530a(15) =54477a(16) =81719a(17) =120175a(18) =173583a(19) =246675a(20) =345345a(21) =476901a(22) =650325a(23) =876525a(24) =1168695a(25) =1542684a(26) =2017356a(27) =2615085a(28) =3362260a(29) =4289780