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Jan5-09, 06:51 PM
P: 2,068
I don't believe that there is any nice formula for that. However, notice that you can calculate that explicitly if you fix some small indexes n and m. It could be, that if you do that, then some pattern becomes visible. So why not calculate it with (n,m)=(1,1), (0,2), (1,3), (2,2), (2,4) and see what happens?