On Thu, Nov 13, 2014 at 6:36 PM, Dave Ray <[email protected]> wrote:

> How about:
>
> (->> (map * (cycle [1 -1]) (range 1 n))
>      (reduce +))
>
>

Thx - I did not know cycle before. I think this is it, although I prefer
nesting over threading. This is another I was thinking about:

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