Sequence - 1.3. - 7.15 A general formula of is

Sequence - 1.3. - 7.15 A general formula of is


(-1)^n [2^n-1](n∈N*)



The solution of general term formula of sequence
1*2*3*4*.n =


N!



General term formula of sequence
What is the general term formula of 2,0,2,0? I know that there is a (n + 1) power of an = (- 1) + 1. I want to know what is its general term formula,


1+(-1)^n-1