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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; text; 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. [See A056391 for pdf file of Chap. 2]
LINKS
FORMULA
A056401(n)-A000007(n-1).
CROSSREFS
Cf. A056386.
Sequence in context: A359050 A071316 A056401 * A250545 A070917 A038757
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)