Hello from a newbie, and thank you for Sage and all the work you're putting 
into it!

I'd like to know you opinion on this.  If this seems useful for the 
community, I believe I can improve 
sage.graphs.graph_coloring.number_of_n_colorings 
by adding pruning during the recursion.  I'm considering the following 
steps:

- Start testing with Git.
- Rename the variables in my code from Czech to English.
- Add comments to the code.
- Integrate it into Sage's code structure.
- Prepare examples with results for testing and comparison.
- Write documentation, etc.

After that, I'd propose adding a new function, e.g. 
number_of_n_colorings_with_pruning, so that the original pure-recursive 
number_of_n_colorings 
remains unchanged.

Do you recommend a different approach?

Best regards, 
Pavel

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