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\begin{document}

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\begin{table}
\centering

\caption{$L(K_n)$ مقادیر}
\begin{tabular}{|c|c||c|c||c|c|}

\hline
$n$  & $L(K_n)$ & $n$ & $L(K_n)$ &$n$ & $L(K_n)$ \\ \hline \hline
0  & 0 & 7 & 0.438864 & 14 & 0.504532 \\ \hline
1  & 1 & 8 & 0.489038 & 15 & 0.486391 \\ \hline
2  & 0 & 9 & 0.532252 & 16 & 0.472903 \\ \hline
3  & 0.75 & 10 & 0.554748 & 17 & 0.464845 \\ \hline
4  & 0.592593 & 11 & 0.556775 & 18 & 0.462077 \\ \hline
5  & 0.468750 & 12 & 0.544552 & 19 & 0.463897 \\  \hline
6  & 0.416142 & 13 & 0.525208 &   &  \\ \hline
\hline 
\end{tabular}
\end{table}

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