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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
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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COMMENTS
| A string and its reverse are considered to be equivalent. Permuting the colors 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
| A056334(n)-A056333(n).
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CROSSREFS
| Cf. A056321.
Sequence in context: A080254 A190916 A161736 * A056329 A190982 A082677
Adjacent sequences: A056336 A056337 A056338 * A056340 A056341 A056342
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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