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A056336
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Number of primitive (aperiodic) reversible string structures with n beads using exactly two different colors.
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0
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0, 1, 2, 4, 9, 16, 35, 66, 133, 261, 527, 1032, 2079, 4123, 8244, 16440, 32895, 65639, 131327, 262380, 524762, 1049071, 2098175, 4195230, 8390646, 16779231, 33558392, 67112892, 134225919, 268443306
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure. Identical to A056331 for 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
| A056331(n)-A000007(n-1).
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CROSSREFS
| Cf. A056318.
Sequence in context: A005980 A128093 A056331 * A203318 A060401 A063981
Adjacent sequences: A056333 A056334 A056335 * A056337 A056338 A056339
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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