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A056277 Number of primitive (aperiodic) word structures of length n using a 6-ary alphabet. 1
1, 1, 4, 13, 51, 197, 875, 4096, 20643, 109246, 601491, 3402911, 19628063, 114699438, 676207572, 4010086352, 23874362199, 142508702805, 852124263683, 5101098123207, 30560194492576, 183176169456214 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Permuting the alphabet will not change a word structure. Thus aabc and bbca have the same structure.

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)*A056273(n/d) where d|n and n>0.

CROSSREFS

Cf. A054721.

Sequence in context: A149461 A056276 A144035 * A082951 A135345 A149462

Adjacent sequences:  A056274 A056275 A056276 * A056278 A056279 A056280

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 13 22:31 EDT 2020. Contains 336464 sequences. (Running on oeis4.)