A056403 - OEIS

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A056403

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

1, 1, 3, 9, 16, 102, 130, 800, 1889, 11089, 17598, 179255, 233448, 1865925, 5603767, 22468480, 44744046, 477260541, 636308684, 5732446015, 15272176563, 73301037291, 133274359128, 1466413083360

(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..24.

FORMULA

Sum mu(d)*A056393(n/d) where d|n.

CROSSREFS

Cf. A056383.

Sequence in context: A117108 A223188 A145796 * A181349 A240094 A174180

Adjacent sequences: A056400 A056401 A056402 * A056404 A056405 A056406

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved