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Search: id:A056449
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A056449 Palindromes using a maximum of three different symbols. +0
5
3, 3, 9, 9, 27, 27, 81, 81, 243, 243, 729, 729, 2187, 2187, 6561, 6561, 19683, 19683, 59049, 59049, 177147, 177147, 531441, 531441, 1594323, 1594323, 4782969, 4782969, 14348907, 14348907, 43046721 (list; graph; listen)
OFFSET

1,1

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

3^[(n+1)/2].

CROSSREFS

Cf. A016116.

Sequence in context: A107443 A062234 A086739 this_sequence A128019 A108411 A100066

Adjacent sequences: A056446 A056447 A056448 this_sequence A056450 A056451 A056452

KEYWORD

nonn

AUTHOR

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

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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