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Search: id:A056475
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| A056475 |
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Number of palindromic structures using exactly six different symbols. |
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+0
2
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| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 21, 21, 266, 266, 2646, 2646, 22827, 22827, 179487, 179487, 1323652, 1323652, 9321312, 9321312, 63436373, 63436373, 420693273, 420693273, 2734926558
(list; graph; listen)
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OFFSET
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1,13
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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], 6).
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CROSSREFS
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Cf. A000770, A056471.
Sequence in context: A022355 A048245 A056485 this_sequence A165842 A004510 A141439
Adjacent sequences: A056472 A056473 A056474 this_sequence A056476 A056477 A056478
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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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