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A056338
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Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.
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0
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0, 0, 0, 1, 6, 37, 183, 876, 3930, 17179, 73095, 306323, 1267266, 5198374, 21182337, 85910040, 347187210, 1399447578, 5629911015, 22616239535, 90754854843, 363890053582, 1458172596903, 5840531328120, 23385650196084
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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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
| A056333(n)-A056332(n).
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CROSSREFS
| Cf. A056320.
Sequence in context: A097297 A047670 A129552 * A056328 A156185 A057418
Adjacent sequences: A056335 A056336 A056337 * A056339 A056340 A056341
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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