Find the First Term a_n=2(4)^n

$a_{n} = 2 {(4)}^{n}$

Substitute in the value of $n$ to find the $n$ th term.

$a_{1} = 2 {(4)}^{1}$

Evaluate the exponent.

$a_{1} = 2 \cdot 4$

Multiply $2$ by $4$ .

$a_{1} = 8$