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A056408
Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly four different symbols.
0
0, 0, 0, 1, 3, 37, 63, 478, 1316, 8594, 14619, 155961, 211231, 1732844, 5302820, 21559430, 43398413, 466493982, 625545865, 5659491433, 15126813702, 72778010746, 132561145173, 1460519397614, 2338565021379
OFFSET
1,5
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
CROSSREFS
Cf. A056388.
Sequence in context: A323829 A139842 A091824 * A056398 A092074 A183556
KEYWORD
nonn
STATUS
approved