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A056269 Number of primitive (aperiodic) words of length n which contain exactly four different symbols. 1
0, 0, 0, 24, 240, 1560, 8400, 40800, 186480, 818280, 3498000, 14674440, 60780720, 249393480, 1016542560, 4123132800, 16664094960, 67171179600, 270232006800, 1085569963080, 4356217672800, 17466683473800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

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]

LINKS

Table of n, a(n) for n=1..22.

FORMULA

sum mu(d)*A000919(n/d) where d|n.

Seems to be n * A056289.

CROSSREFS

Cf. A000302, A000919, A054719.

Sequence in context: A192849 A253285 A052796 * A000919 A268966 A014340

Adjacent sequences:  A056266 A056267 A056268 * A056270 A056271 A056272

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 6 22:02 EDT 2020. Contains 336256 sequences. (Running on oeis4.)