Is there a correlation between cn and c-n in sawtooth Fourier?

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Trying to figure out the relationship between c and the 1-power...

(-1)n+1 · i/n = c-n

Given that cn= (-1)n · i/n

So, would this imply that c-n = cn · -i/n ?
 
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If youre trying to find a relation b/w cn ad c-n then youre wrong.
 

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