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A056517 Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols. 2
1, 1, 1, 3, 4, 10, 14, 36, 50, 138, 202, 561, 875, 2571, 4105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. 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..15.

FORMULA

Sum mu(d)*A056507(n/d) where d|n.

CROSSREFS

Cf. A056480.

Sequence in context: A121720 A056515 A056516 * A285042 A319719 A048155

Adjacent sequences:  A056514 A056515 A056516 * A056518 A056519 A056520

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

Corrected by T. D. Noe, Oct 25 2006

STATUS

approved

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Last modified July 20 23:29 EDT 2019. Contains 325189 sequences. (Running on oeis4.)