已知等比数列{a_n}的前n项和为S_n，若S₄、S₂、S₃成等差数列，且a₂+a₃+a₄=﹣18，若S_n≥2016，则n的取值范围为____ 

在直角坐标系 $xOy$ 中，直线 $l$ 的参数方程为 $\text{{}\begin{array}{c}x=3+t,\\ y=\sqrt{3}t\end{array}$ （ $t$ 为参数），以原点为极点， $x$ 轴正半轴为极轴建立极坐标系，圆 $C$ 的极坐标方程为 $\rho =2\sqrt{3}\text{sin}\theta$ .

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