A056401 - OEIS

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A056401

Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of two different symbols.

1, 1, 2, 4, 5, 16, 13, 42, 49, 133, 107, 600, 351, 1385, 2164, 4416, 4115, 22043, 14601, 67872, 88360, 209827, 190745, 1074534, 839122, 2796647, 3730532, 11275300, 9587579, 67193198, 35792567

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

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..31.

FORMULA

Sum mu(d)*A056391(n/d) where d divides n.

CROSSREFS

Cf. A056381.

Sequence in context: A229131 A359050 A071316 * A056406 A250545 A070917

Adjacent sequences: A056398 A056399 A056400 * A056402 A056403 A056404

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved