Number of n-bead necklaces labeled with numbers 1..5 allowing reversal, with no adjacent beads differing by more than 1.

A208718

Number of n-bead necklaces labeled with numbers 1..5 allowing reversal, with no adjacent beads differing by more than 1.

Terms

    a(0) =5a(1) =9a(2) =13a(3) =24a(4) =38a(5) =78a(6) =140a(7) =306a(8) =634a(9) =1464a(10) =3326a(11) =8066a(12) =19454a(13) =48534a(14) =121294a(15) =308154a(16) =785222a(17) =2018548a(18) =5203634a(19) =13482426a(20) =35019010a(21) =91251438a(22) =238278314a(23) =623629333a(24) =1635062126a(25) =4294493670a(26) =11296419934a(27) =29757590061a(28) =78489973742a(29) =207281830814

External references