Generating functions with n term outside

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SUMMARY

The discussion centers on the feasibility of generating functions that include a term outside the summation, specifically in the form of \(2^n \sum (b_n(0.5)^n z^n)\). The participant clarifies that while the notation can be ambiguous, it is essential to differentiate between \(2^n \sum_k (b_k(0.5)^k z^k)\) and \(\sum_n 2^n(b_n(0.5)^n z^n)\). The closed formula for \(b_n\) is also mentioned, indicating that it plays a crucial role in constructing the generating function.

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SpartanG345
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Homework Statement



Discrete mathematics

is it possible to have a generating function where there is an n term outside the sum?

such as

2^n SUM ( bn(0.5)^n * z^n)

eg the 1st turn would be 2^n bo z^0

when you evaluate the series it evaluates to the series which i am trying to create a generating function for. NB bn is another generating function.

I also have the closed formula for bn.
 
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Assuming the sum itself is over the index n, that would be bad notation. It means the same as 2^n \sum_k (b_k(0.5)^k z^k) but NOT the same as \sum_n 2^n(b_n(0.5)^n z^n) with which it could easily be confused. On the other hand if the sum is over, say, index i from 0 to n, it would be perfectly good.
 

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