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A056475
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Number of palindromic structures using exactly six different symbols.
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1
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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; refs; listen; history; internal format)
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OFFSET
| 1,13
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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
| stirling2( [(n+1)/2], 6).
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CROSSREFS
| Cf. A000770, A056471.
Sequence in context: A022355 A048245 A056485 * A165842 A183738 A004510
Adjacent sequences: A056472 A056473 A056474 * A056476 A056477 A056478
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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