Number of aperiodic bracelets (turnover necklaces) with n beads of 3 colors.

Terms

a(0) =3a(1) =3a(2) =7a(3) =15a(4) =36a(5) =79a(6) =195a(7) =477a(8) =1209a(9) =3168a(10) =8415a(11) =22806a(12) =62412a(13) =172887a(14) =481552a(15) =1351485a(16) =3808080a(17) =10780653a(18) =30615351a(19) =87226932a(20) =249144506a(21) =713378655a(22) =2046856563a(23) =5884468110a(24) =16946569332a(25) =48883597728a(26) =141217159239