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A056271 Number of primitive (aperiodic) words of length n which contain exactly six different symbols. 1
0, 0, 0, 0, 0, 720, 15120, 191520, 1905120, 16435440, 129230640, 953028720, 6711344640, 45674173440, 302899156560, 1969146930240, 12604139926560, 79694818842240, 499018753280880, 3100376788241040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

LINKS

Table of n, a(n) for n=1..20.

FORMULA

Sum mu(d)*A000920(n/d) where d|n.

CROSSREFS

Cf. A000400, A000920, A054721.

Sequence in context: A112002 A004033 A137891 * A000920 A052779 A037212

Adjacent sequences:  A056268 A056269 A056270 * A056272 A056273 A056274

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

STATUS

approved

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Last modified November 24 10:09 EST 2014. Contains 249882 sequences.