OFFSET
1,2
COMMENTS
A complicated formula has been found but needs to be simplified before entering here; also, a Maple program is on the way.
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