Number of n-bead necklaces labeled with numbers 1..6 allowing reversal, with no adjacent beads differing by more than 1.

A208719

Number of n-bead necklaces labeled with numbers 1..6 allowing reversal, with no adjacent beads differing by more than 1.

Terms

    a(0) =6a(1) =11a(2) =16a(3) =30a(4) =48a(5) =100a(6) =182a(7) =404a(8) =850a(9) =1996a(10) =4614a(11) =11391a(12) =28002a(13) =71236a(14) =181710a(15) =471437a(16) =1227712a(17) =3226816a(18) =8509930a(19) =22564205a(20) =60002088a(21) =160113626a(22) =428273964a(23) =1148410792a(24) =3085474406a(25) =8305718893a(26) =22394409228a(27) =60474491712a(28) =163531569910a(29) =442782412569

External references