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A056523 Number of primitive (period n) periodic palindromic structures using exactly six different symbols. 1
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 13, 21, 154, 266, 1488, 2646, 12857, 22827, 101484, 179487, 752646, 1323652, 5325226, 9321312, 36387267 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,12

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..26.

FORMULA

A056517(n)-A056516(n).

EXAMPLE

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure. This should be different from A056512.

CROSSREFS

Column 6 of A285037.

Cf. A056485.

Sequence in context: A269309 A203854 A325448 * A056512 A158998 A122559

Adjacent sequences:  A056520 A056521 A056522 * A056524 A056525 A056526

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

a(16)-a(26) from Andrew Howroyd, Apr 09 2017

STATUS

approved

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Last modified July 18 19:00 EDT 2019. Contains 325144 sequences. (Running on oeis4.)