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Topic review (newest first)
There are a lot of possibilities here.
Anyway, we can easily extend the recursion if not the formula for any number of variables and experiment with the terms.
Oh yes and quite useless unless you have exactly 4 colors.
That's a good one!
for n = 2, 3, 4, ...
No problem! Thank you for the formula.
Oop answer was wrong
It causes problem like flooring if it's not written..