Number of orientable necklaces with 2n beads and two colors which when turned over produce their own color complement.

A059078

Number of orientable necklaces with 2n beads and two colors which when turned over produce their own color complement.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =6a(6) =12a(7) =27a(8) =54a(9) =113a(10) =228a(11) =465a(12) =934a(13) =1890a(14) =3798a(15) =7644a(16) =15350a(17) =30840a(18) =61878a(19) =124173a(20) =249008a(21) =499318a(22) =1000866a(23) =2005971a(24) =4019446a(25) =8053062a(26) =16131780a(27) =32311665a(28) =64711820a(29) =129589530

External references