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A056401
Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of two different symbols.
2
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
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]
FORMULA
Sum mu(d)*A056391(n/d) where d divides n.
CROSSREFS
Cf. A056381.
Sequence in context: A229131 A359050 A071316 * A056406 A250545 A070917
KEYWORD
nonn
STATUS
approved