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A056395
Number of step shifted (decimated) sequence structures using a maximum of six different symbols.
3
1, 2, 4, 11, 18, 117, 161, 1193, 3530, 27569, 60333, 863409, 1636609, 19122031, 84580125, 501915567, 1492170609, 23751685183, 47340359591, 637742820401, 2546703019245, 18317620839483, 49923584451715
OFFSET
1,2
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
Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
CROSSREFS
Cf. A056375.
Sequence in context: A056393 A319417 A056394 * A288621 A053031 A018674
KEYWORD
nonn
STATUS
approved