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A056329
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Number of 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, 21393, 123680, 690550, 3756151, 20042589, 105394296, 548123982, 2826435403, 14479204833, 73794961960, 374603884910, 1895632969351, 9568915372269, 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
| A056324(n)-A056323(n).
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CROSSREFS
| Cf. A056312.
Sequence in context: A190916 A161736 A056339 * A190982 A082677 A185818
Adjacent sequences: A056326 A056327 A056328 * A056330 A056331 A056332
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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