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A056480
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Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols.
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2
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1, 0, 1, 1, 4, 3, 14, 13, 50, 47, 202, 197, 875, 861, 4105, 4096, 20647, 20593, 109298, 109246, 601476, 601289, 3403126, 3402911, 19628059, 19627188, 114700263, 114699438, 676207627, 676203467, 4010090462
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Permuting the symbols 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
| Sum mu(d)*A056471(n/d) where d|n.
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CROSSREFS
| Cf. A056462.
Sequence in context: A082383 A056478 A056479 * A197883 A095332 A195586
Adjacent sequences: A056477 A056478 A056479 * A056481 A056482 A056483
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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