A103442 Row sums of A103441. Number of two-colored bracelets of n beads with different sets of distances among the white beads.

1, 2, 4, 6, 11, 16, 27, 44, 73, 124, 199, 372, 613, 1142, 1874, 3926, 6209, 13660, 21539, 46240, 80142

Offset

2,2

Links

Table of n, a(n) for n=2..22.

Mathematica

(* see A103441 *) Table[Length[Union[(dist[f[ #1], n]&)/@Flatten[Table[ListNecklaces[n, Join[1+0*Range[i], 0*Range[n-i]], Dihedral], {i, 1, n-1}], 1]]], {n, 2, 16}]

Crossrefs

Cf. A103441, A056342.

Sequence in context: A115269 A103692 A114921 * A238375 A056342 A094719

Adjacent sequences: A103439 A103440 A103441 * A103443 A103444 A103445

Keyword

hard,nonn

Author

Wouter Meeussen, Feb 06 2005

Extensions

a(21) & a(22) from Robert G. Wilson v, Aug 09 2010

Status

approved