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A145208
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Number of distinct shuffles of the identity permutation on n letters with the halfway-wrapped around permutation k+1,k+2,...,n-1,n,1,2,...,k where k=floor(n/2)
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0
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1, 4, 13, 54, 197, 792, 2977, 11750, 44744, 175066, 671783, 2619148, 10104590
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A complicated formula has been found but needs to be simplified before entering here; also, a Maple program is on the way.
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REFERENCES
| C. Smith, dissertation, Harvard University, forthcoming.
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EXAMPLE
| For n=2, the distinct shuffles of 12 with 21 are: 1221, 1212, 2112, 2121.
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CROSSREFS
| Sequence in context: A149466 A006604 A082570 * A149467 A149468 A149469
Adjacent sequences: A145205 A145206 A145207 * A145209 A145210 A145211
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KEYWORD
| nonn
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AUTHOR
| Camillia Smith (cammie(AT)math.harvard.edu), Oct 04 2008
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