On May 18, 7:27 pm, RJB <rbott...@csusb.edu> wrote:

> Thank you!  Very cool and clear.  I
> hoped that there was something that Python made natural I couldn't see
> after 50 years in other languages.
>
> I'd like to work on combining both approaches.  It may take a while...

>From the Knuth identity F[n+m] = ..
you pulled out two special cases
F[2n+1] = ..
and
F[2n] = ..

If you get one more: F[2n -1] = ..
you are done
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