Simplify a double sum

Question:Simplify a double sum

Posted: Chaggara 60 Product: Maple

December 16 2020

Dear All

I would like to calculate the five first terms of a polynomial sequence

I wrote in maple

sum(x^r*(sum((-1)^s*binomial(r, s)*pochhammer((a+s+1)*d, n), s = 0 .. r))/factorial(r), r = 0 .. n), n = 0 .. 4);

I obtained

0,0,0,0,0

which seems to be false

where is the problem

Best regards

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