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A056268 Number of primitive (aperiodic) words of length n which contain exactly three different symbols. 1

%I

%S 0,0,6,36,150,534,1806,5760,18144,55830,17100,6,518580,1569750,

%T 4732014,14250450,42844320,128746950,38661,5376,1160688606,3483582660,

%U 10454059938,31368305694,941180,13006,282378679920

%N Number of primitive (aperiodic) words of length n which contain exactly three different symbols.

%D M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

%F sum mu(d)*A001117(n/d) where d|n.

%Y Cf. A000244, A001117, A054718.

%K nonn

%O 1,3

%A _Marks R. Nester_

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Last modified September 27 13:13 EDT 2020. Contains 337380 sequences. (Running on oeis4.)