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

Author

Wouter Meeussen, Feb 06 2005

Keywords

• hard
• nonn

Crossrefs

Cf. A103441, A056342.

Programs

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}]

Extensions

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