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Aug 25, 2018 at 20:41 comment added Ira Gessel Yes, either of these would look slightly tidier.
Jun 18, 2018 at 12:47 history edited Ira Gessel CC BY-SA 4.0
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Jun 16, 2018 at 15:51 vote accept Mare
Jun 16, 2018 at 15:11 comment added მამუკა ჯიბლაძე It is very nice anyway, but would not $\sum(-1)^k\frac{k+1}{n-k+1}\binom{2n-3k}{n-k}$ or $\sum(-1)^k\frac{k+1}{n-k+1}\binom{2n-3k}{n-2k}$ look slightly tidier?
Jun 16, 2018 at 14:45 history edited Ira Gessel CC BY-SA 4.0
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Jun 16, 2018 at 14:36 history answered Ira Gessel CC BY-SA 4.0