OFFSET
1,2
COMMENTS
For n=4,5,6, the maximum number is achieved by the following permutations, respectively: 3412, 34512, 456123.
REFERENCES
C. Smith, dissertation, Harvard University, forthcoming.
EXAMPLE
For n=2, the distinct shuffles of 12 with 21 are: 1221, 1212, 2112, 2121.
CROSSREFS
KEYWORD
nonn
AUTHOR
Camillia Smith Barnes, Oct 04 2008
STATUS
approved