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

A115118

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

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =1a(6) =3a(7) =1a(8) =4a(9) =2a(10) =5a(11) =1a(12) =10a(13) =1a(14) =11a(15) =5a(16) =20a(17) =1a(18) =36a(19) =1a(20) =58a(21) =11a(22) =95a(23) =1a(24) =196a(25) =4a(26) =317a(27) =30a(28) =598a(29) =1

External references