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Gamow
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Every context-free language has either polynomial growth or polynomial growth: In the notation of the question poser:

  • Either there is a polynomial $p$ so that $w_n\le p(n)$ for all $n$
  • Or there exists a $c>1$, so that $w_n\ge c^n$ for infinitely many $n$.

This has been shown for instance in:

Martin R. Bridson, Robert H. Gilman:
"Context-Free Languages of Sub-exponential Growth"
Journal of Computer and System Sciences 64, (2002), Pages 308-310

Gamow
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