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A032198
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"CIK" (necklace, indistinct, unlabeled) transform of 1,2,3,4...
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2
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1, 3, 6, 13, 25, 58, 121, 283, 646, 1527, 3601, 8678, 20881, 50823, 124054, 304573, 750121, 1855098, 4600201, 11442085, 28527446, 71292603, 178526881, 447919418, 1125750145, 2833906683, 7144450566, 18036423973
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..28.
Index entries for sequences related to necklaces
C. G. Bower, Transforms (2)
P. Flajolet and M. Soria, The Cycle Construction In SIAM J. Discr. Math., vol. 4 (1), 1991, pp. 58-60.
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FORMULA
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1/n*Sum_{d divides n} phi(n/d)*A004146(d). - Vladeta Jovovic, Feb 15 2003
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PROG
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(PARI)
N = 66; x = 'x + O('x^N);
f(x)=sum(n=1, N, n*x^n );
gf = sum(n=1, N, eulerphi(n)/n*log(1/(1-f(x^n))) );
v = Vec(gf)
/* Joerg Arndt, Jan 21 2013 */
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CROSSREFS
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Cf. A032170.
Equals A005594(n)-1.
Sequence in context: A215984 A074890 A244704 * A079941 A019300 A072762
Adjacent sequences: A032195 A032196 A032197 * A032199 A032200 A032201
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KEYWORD
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nonn
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AUTHOR
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Christian G. Bower
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STATUS
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approved
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