Question 1059503
You need to tell what your n is supposed to mean.  I will use i as the index number and there is a common factor of 2 in use forming the number pattern.


Each term shown is {{{3*2^(i-1)}}}.


If your index was supposed to be given the variable, n, then the general term is simply  {{{3*2^(n-1)}}}.


The question, "what does n equal...", is unclear.  n is any number of the set of Whole Numbers.