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A056330
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Number of 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, 662674, 4662574, 31724735, 210361046, 1367510326, 8752976610, 55343947975, 346541488998, 2153041587538, 13292844257198, 81652683550119, 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
| A056325(n)-A056324(n).
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CROSSREFS
| Cf. A056313.
Sequence in context: A061636 A135326 A056340 * A158516 A163448 A172210
Adjacent sequences: A056327 A056328 A056329 * A056331 A056332 A056333
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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