>>> from ad_series import ad_term

--ini

>>> x = ad_term(2, 1, 2)
>>> round(x, 4) 
4.7124

>>> x = ad_term(2, x, 3)
>>> round(x, 4) 
-1.3903

--fi

>>> x = ad_term(2, x, 4)
>>> round(x, 4) 
3.5919

>>> x = ad_term(2, x, 5)
>>> round(x, 4) 
-1.7034