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A056340
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Number of primitive (aperiodic) reversible string structures with n beads using exactly six different colors.
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0
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0, 0, 0, 0, 0, 1, 12, 142, 1346, 11511, 89974, 662673, 4662574, 31724723, 210361046, 1367510184, 8752976610, 55343946628, 346541488998, 2153041576027, 13292844257186, 81652683460145, 499484958151630
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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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
| A056335(n)-A056334(n).
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CROSSREFS
| Cf. A056322.
Sequence in context: A124206 A061636 A135326 * A056330 A158516 A163448
Adjacent sequences: A056337 A056338 A056339 * A056341 A056342 A056343
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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