[Tex/LaTex] Backslash in tables: end in corner

Question

Is it possible to end the backslash in the left upper corner of the table?

\documentclass{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\begin{document}
\begin{table}
\centering
\begin{tabular}{c|cc}
$c\backslash a$&0&1\\\hline
0&&\\
1&&\\
\end{tabular}
\end{table}
\end{document}

Answer 1

Here it is:

\documentclass{scrartcl}
\usepackage{makecell}
\begin{document}
\begin{table}
\centering
\begin{tabular}{c|cc}

\diaghead(-2,1){aaaaaaa}%
{b}{a}&
0&1\\\hline

0&&\\
1&&\\
\end{tabular}
\end{table}
\end{document}

syntax is: \diaghead(H ratio,V ratio){Text set for column widthi}{First head}{Second head} (makecell manual section 7)

(TikZ solutions look much better in my opinion)