Number of aperiodic binary toroidal necklaces of size n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =8a(5) =12a(6) =36a(7) =36a(8) =114a(9) =166a(10) =396a(11) =372a(12) =1992a(13) =1260a(14) =4644a(15) =8728a(16) =20310a(17) =15420a(18) =87174a(19) =55188a(20) =314064a(21) =399432a(22) =762228a(23) =729444a(24) =5589620a(25) =4026522a(26) =10323180a(27) =19883920a(28) =57516048a(29) =37025580