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A056480 Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols. 3
1, 0, 1, 1, 4, 3, 14, 13, 50, 47, 202, 197, 875, 861, 4105, 4096, 20647, 20593, 109298, 109246, 601476, 601289, 3403126, 3402911, 19628059, 19627188, 114700263, 114699438, 676207627, 676203467, 4010090462 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Permuting the symbols will not change the 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..31.

FORMULA

Sum mu(d)*A056471(n/d) where d|n.

CROSSREFS

Cf. A056462.

Sequence in context: A321262 A056478 A056479 * A284841 A197883 A222195

Adjacent sequences:  A056477 A056478 A056479 * A056481 A056482 A056483

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 21 19:04 EDT 2019. Contains 326168 sequences. (Running on oeis4.)