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Number of bracelets consisting of four instances each of n swappable colors.
4

%I #21 May 01 2023 05:35:59

%S 1,1,7,297,83488,63698215,93945180662,235528677557853,

%T 926363255677856473,5389375509102629522572,44328152493384890722579175,

%U 497321572654372894502827791849,7392063525541285464935001208117037,142098205771751298697282911028204773107

%N Number of bracelets consisting of four instances each of n swappable colors.

%D F. Harary and E. Palmer, Graphical Enumeration, Academic Press, 1973, page 143.

%H Marko Riedel, <a href="/A362658/b362658.txt">Table of n, a(n) for n = 0..45</a>

%H H. Fripertinger, <a href="https://www.researchgate.net/publication/238224437_Enumeration_in_Musical_Theory">Enumeration in Musical Theory</a>, Beiträge zur Elektronischen Musik, 1 (1992).

%H Marko Riedel, math.stackexchange.com, <a href="https://math.stackexchange.com/questions/4687456/">Necklaces and bracelets</a>

%Y Cf. A054499, A362657, A362659.

%K nonn

%O 0,3

%A _Marko Riedel_, Apr 28 2023