9. (5 points) Observing the pattern of numbers in the table below, the 5th number from left to right in the 8th row is $\qquad$ 54 .
\begin{tabular}{|c|c|c|c|c|c|c|c|c|}
\hline Row 1 & & & & & 1 & & & \\
\hline Row 2 & & & & 2 & 3 & 4 & & \\
\hline Row 3 & & & 5 & 6 & 7 & 8 & 9 & \\
\hline Row 4 & & 10 & 11 & 12 & 13 & 14 & 15 & 16 \\
\hline \begin{tabular}{l} 
Row 5
\end{tabular} & 17 & 18 & 19 & 20 & $\cdots$ & & & \\
\hline
\end{tabular}

【Solution】Solution: From the figure, we can see that the number in Row 1 is 1,
the last number in Row 2 is $2 \times 2=4$,
the last number in Row 3 is $3 \times 3=9$,
$\qquad$
so the last number in Row 7 is $7 \times 7=49$,
then the first number in Row 8 is $49+1=50$, and the 5th number is $50+4=54$, hence the answer is: 54.
9. (5 points) Observe the pattern of numbers in the table below, it can be known that in the 8th row, the 5th number from left to right is



Preserve the original text's line breaks and format, and output the translation result directly.