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Question: Where is my error ???

Question:Where is my error ???

sand15 797 Maple 2016
sum
March 28 2018
1

I wrote this simple set of instructions  (Maple 2015 and Maple 2016)

restart:
p := x -> sum('a__||k' * x^k, k=0..5):
p(x);    # returns a0+ a1x +  ... + a5x5

p(1);   # returns a0+ ... + a5

p(0);   # returns 0 ...  not a0


Probably so huge a mistake that I can't see it !?!?!?

Could you please help me to fit it ?

TIA
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