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→Description
1, & \mbox{if }n\mbox{ =0} \\
1, & \mbox{if }n\mbox{ =0} \\
a^{a^{(n-1)}}, & \mbox{if }n\mbox{ >0}
a^{a^{(n-1)}}, & \mbox{if }n\mbox{ >0}
\end{cases}</math>
\end{cases}
</math>
\begin{cases}
\begin{cases}