[Tex/LaTex] Horner scheme with a tabular

tables

I know there exists a standard code for a Horner scheme. But I would like to get the following tabular.

enter image description here

I've got the next code but I can't find how I get that little vertical line at the right bottom.

\begin{tabular}{c|cccc}  
        & 3 & 2 & -5 & -10 \\   
    &   &   &    &     \\ \hline  
        &   &   &    &    
\end{tabular}

I've got another question about this. The number 11 is now shifted to the left, but I want that it's under 16. 

\begin{tabular}{c|cccc}  
  & 3 & 2 & -5 & -10 \\   
  2 & $\downarrow$  & 6  & 16    & 22   \\ \hline  
  & 3  & 8  &  11   \multicolumn{1}{c|}{}  & 12   
\end{tabular}

Best Answer

\documentclass{article}
\begin{document}
  $\begin{array}{c|cccc}
        & 3 & 2 & -5 & -10 \\
    &   &   &    &     \\ \hline
        &   &   & \multicolumn{1}{c|}{}   &
\end{array}$
\end{document}

enter image description here

If you want it to be thick,

\documentclass{article}
\usepackage{array}
\begin{document}
  $\begin{array}{c|cccc}
        & 3 & 2 & -5 & -10 \\
    &   &   &    &     \\ \hline
        &   &   &    & \multicolumn{1}{!{\vrule width 1.5pt}c}{}
\end{array}$
\end{document}

enter image description here

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