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Aug 11, 2022 at 20:47 comment added Ira Gessel One thing you might try is multiply (3) by $z^s/s!$ and sum on $s$, and apply Taylor's theorem. This will give you a simple closed form for the generating function in $s$ of (1).
S Aug 11, 2022 at 14:02 review First questions
Aug 11, 2022 at 14:36
S Aug 11, 2022 at 14:02 history asked JayanthJ CC BY-SA 4.0