find the first five terms of the sequence whose nth term is given. (-2)^n + 2^n
every odd-numbered term is 0.
every even numbered term is 2^n + 2^n = 2^(n+1)
so,
0 8 0 32 0
every even numbered term is 2^n + 2^n = 2^(n+1)
so,
0 8 0 32 0