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Search: id:A056474
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| A056474 |
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Number of palindromic structures using exactly five different symbols. |
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+0
2
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| 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 15, 15, 140, 140, 1050, 1050, 6951, 6951, 42525, 42525, 246730, 246730, 1379400, 1379400, 7508501, 7508501, 40075035, 40075035, 210766920, 210766920, 1096190550
(list; graph; listen)
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OFFSET
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1,11
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COMMENT
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Permuting the symbols will not change the structure.
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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stirling2( [(n+1)/2], 5).
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CROSSREFS
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Cf. A000481, A056470.
Sequence in context: A036379 A070920 A056484 this_sequence A134912 A094836 A004504
Adjacent sequences: A056471 A056472 A056473 this_sequence A056475 A056476 A056477
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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