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A056407 Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly three different symbols. 0
0, 0, 1, 4, 8, 49, 54, 280, 524, 2362, 2872, 22694, 21866, 131696, 298783, 904634, 1341518, 10744516, 10748218, 72886710, 145274501, 522816718, 713023210, 5892611212, 7059926597, 35300963684, 70604007679 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

See A056371 for an explanation of step shifts. 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. [See A056391 for pdf file of Chap. 2]

LINKS

Table of n, a(n) for n=1..27.

FORMULA

A056402(n)-A056401(n).

CROSSREFS

Cf. A056387.

Sequence in context: A045882 A051681 A267987 * A056397 A189314 A215746

Adjacent sequences:  A056404 A056405 A056406 * A056408 A056409 A056410

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified September 19 06:50 EDT 2017. Contains 292232 sequences.