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A056503 Periodic palindromic structures using a maximum of two different symbols. 4
1, 2, 2, 4, 4, 7, 8, 14, 16, 26, 32, 51, 64, 100, 128, 198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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.

LINKS

Table of n, a(n) for n=1..16.

FORMULA

No formula known - terms found by computer search.

CROSSREFS

Cf. A016116.

Sequence in context: A222738 A005308 A151532 * A055636 A206559 A143419

Adjacent sequences:  A056500 A056501 A056502 * A056504 A056505 A056506

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

STATUS

approved

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Last modified December 17 19:18 EST 2014. Contains 252038 sequences.