Definition (1): Number of n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed.

A000013

Definition (1): Number of n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =4a(6) =8a(7) =10a(8) =20a(9) =30a(10) =56a(11) =94a(12) =180a(13) =316a(14) =596a(15) =1096a(16) =2068a(17) =3856a(18) =7316a(19) =13798a(20) =26272a(21) =49940a(22) =95420a(23) =182362a(24) =349716a(25) =671092a(26) =1290872a(27) =2485534a(28) =4794088a(29) =9256396

External references