Number of n-bead necklaces labeled with numbers 1..7 not allowing reversal, with no adjacent beads differing by more than 1.

A208776

Number of n-bead necklaces labeled with numbers 1..7 not allowing reversal, with no adjacent beads differing by more than 1.

Terms

    a(0) =7a(1) =13a(2) =19a(3) =36a(4) =63a(5) =143a(6) =299a(7) =719a(8) =1711a(9) =4249a(10) =10611a(11) =27144a(12) =69727a(13) =181467a(14) =475147a(15) =1253475a(16) =3324103a(17) =8862889a(18) =23729747a(19) =63791064a(20) =172066959a(21) =465577215a(22) =1263208683a(23) =3435919395a(24) =9366558151a(25) =25585896137a(26) =70019831931a(27) =191943278804a(28) =526978629663

External references