Which recursive definition could be used to generate the sequence {1, 2,2,4,8,32}

Given that the sequence is:

1,2,4,8,32

the recursive formula will be found as follows:

first term is=1

the sequence can be written as:

1,2,4,8,32

= (1*2^0), (1*2^1), (1*2^2), (1*2^3), (1*2^4)

thus the recursive formula will be

an=a1 (r) ^ (n-1)

plugging the values we get:

an=1 (2) ^ (n-1)