Number of Lyndon words (aperiodic necklaces) with 6 beads of n colors.

Terms

a(0) =0a(1) =9a(2) =116a(3) =670a(4) =2580a(5) =7735a(6) =19544a(7) =43596a(8) =88440a(9) =166485a(10) =295020a(11) =497354a(12) =804076a(13) =1254435a(14) =1897840a(15) =2795480a(16) =4022064a(17) =5667681a(18) =7839780a(19) =10665270a(20) =14292740a(21) =18894799a(22) =24670536a(23) =31848100a(24) =40687400a(25) =51482925a(26) =64566684a(27) =80311266a(28) =99133020a(29) =121495355