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A056452 Palindromes using a maximum of six different symbols. +0
6
6, 6, 36, 36, 216, 216, 1296, 1296, 7776, 7776, 46656, 46656, 279936, 279936, 1679616, 1679616, 10077696, 10077696, 60466176, 60466176, 362797056, 362797056, 2176782336, 2176782336, 13060694016, 13060694016, 78364164096 (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

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

MAPLE

A056452:=n->6^floor((n+1)/2);

CROSSREFS

Cf. A016116.

Adjacent sequences: A056449 A056450 A056451 this_sequence A056453 A056454 A056455

Sequence in context: A111437 A056464 A056454 this_sequence A038260 A165424 A156099

KEYWORD

nonn,base

AUTHOR

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

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.


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