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A056515 Number of primitive (period n) periodic palindromic structures using a maximum of four different symbols. 3
1, 1, 1, 3, 4, 10, 14, 35, 49, 127, 186, 463, 714, 1799, 2789, 6996 (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..16.

FORMULA

Sum mu(d)*A056505(n/d) where d|n.

Moebius transform of A056505.

CROSSREFS

Cf. A056478.

Sequence in context: A106523 A007068 A121720 * A056516 A056517 A285042

Adjacent sequences:  A056512 A056513 A056514 * A056516 A056517 A056518

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)