For $n \ge 2$, let ${S_n}$ denote the set of all subsets of $\{ 1,2, \ldots ,n\} $ with no two consecutive numbers. For example $\{ 1,3,5\} \in {S_6}$, but $\{ 1,2,4\} \notin {S_6}$. Then $n\left( {{S_5}} \right)$ is equal to ____.
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