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A056381 Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of two different symbols. 1
2, 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

1,1

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. [See A056391 for pdf file of Chap. 2]

LINKS

Table of n, a(n) for n=1..31.

FORMULA

Sum mu(d)*A056371(n/d) where d divides n.

CROSSREFS

Sequence in context: A325867 A333045 A050047 * A245597 A324039 A019463

Adjacent sequences: A056378 A056379 A056380 * A056382 A056383 A056384

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified February 6 03:21 EST 2023. Contains 360091 sequences. (Running on oeis4.)