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May 20, 2012 at 23:12 vote accept Chris Bond
May 20, 2012 at 22:35 comment added Raphael It is easy to see here, but those $\dots$ need an induction proof in general, and the pattern may be hard to spot. (Just the obligatory pedantic note.)
May 20, 2012 at 22:12 history answered jmad CC BY-SA 3.0