0,2

a(n-9)=number of aperiodic necklaces (Lyndon words) with 8 black beads and n-8 white beads.

D. J. Broadhurst, On the enumeration of irreducible k-fold Euler sums and their roles in knot theory and field theory

Index entries for sequences related to Lyndon words

G.f.: (1+x^2)/((1-x)*(1-x^2))^4

Cf. A000031, A001037, A051168.

Adjacent sequences: A031161 A031162 A031163 this_sequence A031165 A031166 A031167

Sequence in context: A062486 A053698 A059140 this_sequence A116600 A074033 A093920

nonn,easy

David Broadhurst (D.Broadhurst(AT)open.ac.uk)