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A056386 Number of primitive (aperiodic) step shifted (decimated) sequences using exactly two different symbols. 1
0, 2, 4, 8, 10, 32, 26, 84, 98, 266, 214, 1200, 702, 2770, 4328, 8832, 8230, 44086, 29202, 135744, 176720, 419654, 381490, 2149068, 1678244, 5593294, 7461064, 22550600, 19175158, 134386396, 71585134 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A056371 for an explanation of step shifts.

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..31.

FORMULA

Sum mu(d)*A056376(n/d) where d divides n.

CROSSREFS

Sequence in context: A124849 A056654 A020950 * A210108 A217131 A116636

Adjacent sequences:  A056383 A056384 A056385 * A056387 A056388 A056389

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified May 23 14:30 EDT 2013. Contains 225602 sequences.