%N Maximal number of distinct shuffles of the identity permutation on n letters with another permutation on n letters.
%C For n=4,5,6, the maximum number is achieved by the following permutations, respectively: 3412, 34512, 456123.
%D C. Smith, dissertation, Harvard University, forthcoming.
%e For n=2, the distinct shuffles of 12 with 21 are: 1221, 1212, 2112, 2121.
%A _Camillia Smith Barnes_, Oct 04 2008