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A056470
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Number of palindromic structures using a maximum of five different symbols.
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5
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1, 1, 2, 2, 5, 5, 15, 15, 52, 52, 202, 202, 855, 855, 3845, 3845, 18002, 18002, 86472, 86472, 422005, 422005, 2079475, 2079475, 10306752, 10306752, 51263942, 51263942, 255514355, 255514355, 1275163905
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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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
| a(2n-1) = a(2n) = A056272(n). [R. J. Mathar, Nov 24 2010]
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CROSSREFS
| Cf. A056451.
Sequence in context: A097438 A205482 A055879 * A056471 A164904 A188164
Adjacent sequences: A056467 A056468 A056469 * A056471 A056472 A056473
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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