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A056482 Number of primitive (aperiodic) palindromic structures using exactly three different symbols. 1
0, 0, 0, 0, 1, 1, 6, 6, 25, 24, 90, 89, 301, 295, 965, 960, 3025, 2999, 9330, 9305, 28495, 28411, 86526, 86430, 261624, 261324, 788945, 788669, 2375101, 2374110, 7141686 (list; graph; refs; listen; history; internal format)
OFFSET

1,7

COMMENTS

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.

FORMULA

A056477(n)-A056476(n).

CROSSREFS

Cf. A056464.

Sequence in context: A141388 A087236 A077193 * A123874 A016725 A151779

Adjacent sequences:  A056479 A056480 A056481 * A056483 A056484 A056485

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 18:01 EST 2012. Contains 206061 sequences.