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Yep, just recently covered here.
(I think) this topic's been done before, but anyway...
3n3, I expect. I may be wrong.
Well, I know what factorials are, it is n*(n1)*(n2), etc. until you've gone all the way down to zero. What i'm looking for is a way to express n+(n1)+(n2), etc. Do you know of any way to write this? 