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Line 13:
Line 13: − + − − \begin{cases} − n/2, & \mbox{if }n\mbox{ is even} \\ − 3n+1, & \mbox{if }n\mbox{ is odd} − \end{cases}
→Description
\begin{cases}
\begin{cases}
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}
\end{cases}
</math>
</math>
==Examples==
==Examples==