Question

Choose a formula for the nth term of the sequence:
a2 , a4 , a6 , ...
2 4 8


a^2n
2^n

a^2n
2n

a^2n
2+n

2^n
a

Answer 1

The notation is kind of weird, but it appears that

a2n = 2^n

Answer 2

this question had me confused, thank you!