Solve for n
n=\sqrt{-\frac{u_{n}+1}{u_{n}-2}}
n=-\sqrt{-\frac{u_{n}+1}{u_{n}-2}}\text{, }u_{n}\geq -1\text{ and }u_{n}<2
Solve for u_n
u_{n}=-\frac{1-2n^{2}}{n^{2}+1}
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