Number of n-bead necklaces labeled with numbers 1..7 allowing reversal, with no adjacent beads differing by more than 1.

A208720

Number of n-bead necklaces labeled with numbers 1..7 allowing reversal, with no adjacent beads differing by more than 1.

Terms

    a(0) =7a(1) =13a(2) =19a(3) =36a(4) =58a(5) =122a(6) =224a(7) =502a(8) =1066a(9) =2528a(10) =5902a(11) =14717a(12) =36557a(13) =93987a(14) =242387a(15) =635990a(16) =1675743a(17) =4457771a(18) =11903835a(19) =31970464a(20) =86144382a(21) =233001926a(22) =631920076a(23) =1718567054a(24) =4684178054a(25) =12794677456a(26) =35012475762a(27) =95976563897a(28) =263496604025a(29) =724445459431

External references