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A056429
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Step cyclic shifted sequence structures using a maximum of two different symbols.
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3
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1, 2, 2, 4, 3, 8, 5, 14, 11, 26, 15, 88, 37, 130, 184, 357, 261, 1346, 805, 3760, 4434, 9758, 8385, 47462, 33781, 108330, 138767, 408376, 331185, 2251816, 1155735
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. Permuting the symbols will not change the structure.
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
| Cf. A002729.
Sequence in context: A049287 A185959 A006799 * A133806 A185333 A005176
Adjacent sequences: A056426 A056427 A056428 * A056430 A056431 A056432
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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