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Line 13: − +
→Description
\begin{cases}
\begin{cases}
1, & \mbox{if }n\mbox{=0} \\
1, & \mbox{if }n\mbox{=0} \\
a^{[(n-1)a]}, & \mbox{if }n\mbox{ >0}
a, & \mbox{if }n\mbox{ >0}
\end{cases}</math>
\end{cases}</math>