How do you find the nth term for the geometric sequence a1 = -9, n=6, r=2?

${t}_{6} = - 288$
${t}_{n} = {t}_{1} \cdot {r}^{n - 1}$
${t}_{6} = - 9 \cdot {2}^{5}$
${t}_{6} = - 9 \left(32\right)$
${t}_{6} = - 288$