Number of binary toroidal necklaces of size n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =19a(5) =16a(6) =56a(7) =40a(8) =152a(9) =184a(10) =432a(11) =376a(12) =2132a(13) =1264a(14) =4728a(15) =8768a(16) =20688a(17) =15424a(18) =87656a(19) =55192a(20) =315128a(21) =399520a(22) =762984a(23) =729448a(24) =5595408a(25) =4026576a(26) =10325712a(27) =19884504a(28) =57527804a(29) =37025584