Search: id:A005515
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%I A005515 M4105
%S A005515 1,1,6,14,47,111,280,600,1282,2494,4752,8524,14938,25102,41272,
%T A005515 65772,102817,156871,235378,346346,502303,716859,1010256,1404624,
%U A005515 1931540,2625658,3534776,4711448,6226148,8156396,10603704
%N A005515 Number of n-bead bracelets (turn over necklaces) with 10 red beads.
%D A005515 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A005515 W. D. Hoskins; Anne Penfold Street, Twills on a given number of harnesses, 
               J. Austral. Math. Soc. Ser. A 33 (1982), no. 1, 1-15.
%H A005515 <a href="Sindx_Br.html#bracelets">Index entries for sequences related 
               to bracelets</a>
%H A005515 F. Ruskey, <a href="http://www.theory.cs.uvic.ca/~cos/inf/neck/NecklaceInfo.html">
               Necklaces, Lyndon words, De Bruijn sequences, etc.</a>
%t A005515 k = 10; Table[(Apply[Plus, Map[EulerPhi[ # ]Binomial[n/#, k/# ] &, Divisors[GCD[n, 
               k]]]]/n + Binomial[If[OddQ[n], n - 1, n - If[OddQ[k], 2, 0]]/2, If[OddQ[k], 
               k - 1, k]/2])/2, {n, k, 50}] - Robert A. Russell (russell(AT)post.harvard.edu), 
               Sep 27 2004
%Y A005515 Sequence in context: A015892 A093369 A130443 this_sequence A114705 A107301 
               A118432
%Y A005515 Adjacent sequences: A005512 A005513 A005514 this_sequence A005516 A005517 
               A005518
%K A005515 nonn
%O A005515 10,3
%A A005515 N. J. A. Sloane (njas(AT)research.att.com).
%E A005515 Sequence extended and description corrected by Christian G. Bower (bowerc(AT)usa.net)

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