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Search: id:A056339
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| A056339 |
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Number of primitive (aperiodic) reversible string structures with n beads using exactly five different colors. |
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+0
1
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| 0, 0, 0, 0, 1, 9, 76, 542, 3523, 21392, 123680, 690541, 3756151, 20042513, 105394295, 548123440, 2826435403, 14479201301, 73794961960, 374603863517, 1895632969275, 9568915248589, 48208452866816
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OFFSET
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1,6
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COMMENT
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A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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A056334(n)-A056333(n).
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CROSSREFS
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Cf. A056321.
Sequence in context: A066222 A080254 A161736 this_sequence A056329 A082677 A075608
Adjacent sequences: A056336 A056337 A056338 this_sequence A056340 A056341 A056342
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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