Number of aperiodic necklaces of n beads of 2 colors, 11 of them black.

Terms

a(0) =1a(1) =6a(2) =26a(3) =91a(4) =273a(5) =728a(6) =1768a(7) =3978a(8) =8398a(9) =16796a(10) =32065a(11) =58786a(12) =104006a(13) =178296a(14) =297160a(15) =482885a(16) =766935a(17) =1193010a(18) =1820910a(19) =2731365a(20) =4032015a(21) =5864749a(22) =8414640a(23) =11920740a(24) =16689036a(25) =23107896a(26) =31666376a(27) =42975796