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A056406 Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly two different symbols. 0
0, 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; internal format)
OFFSET

1,3

COMMENTS

See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure. Identical to A056401 for n>1.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

A056401(n)-A000007(n-1).

CROSSREFS

Cf. A056386.

Sequence in context: A178436 A071316 A056401 * A070917 A038757 A062549

Adjacent sequences:  A056403 A056404 A056405 * A056407 A056408 A056409

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 10:28 EST 2012. Contains 205763 sequences.