OFFSET

1,8

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

Andrew Howroyd, Table of n, a(n) for n = 1..200

FORMULA

Inverse Moebius transform of A056521. - Andrew Howroyd, Oct 01 2019

EXAMPLE

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure.

CROSSREFS

KEYWORD

nonn

AUTHOR

EXTENSIONS

Corrected by T. D. Noe, Oct 25 2006

a(17)-a(30) from Andrew Howroyd, Apr 07 2017

Terms a(31) and beyond from Andrew Howroyd, Oct 01 2019

STATUS

approved