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A056444
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Number of primitive (period n) step cyclic shifted sequence structures using exactly two different symbols.
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0
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0, 1, 1, 2, 2, 5, 4, 10, 9, 22, 14, 78, 36, 124, 180, 343, 260, 1329, 804, 3732, 4428, 9742, 8384, 47364, 33778, 108292, 138756, 408244, 331184, 2251604, 1155734
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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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. Identical to A056439 fo r n>1.
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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
| A056439(n)-A000007(n-1).
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CROSSREFS
| Cf. A056424.
Sequence in context: A034402 A095057 A056439 * A112472 A124506 A112471
Adjacent sequences: A056441 A056442 A056443 * A056445 A056446 A056447
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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