Question: sequence in maple

I am facing the problem below

                 i have a sequence qn: n=0 to ∞

                 another sequence is defined as pn=qn-1 , n=1 to ∞

                          while i put p1,p2,... i obtain the corresponding values

                              but when i entered p0 i get the value which is not related to qn

                                 from where it derives that value & how to correct that problem?

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