\documentclass{article}
\usepackage{booktabs}
\usepackage{supertabular}
\usepackage[font=rm]{caption}
\begin{document}

\begin{center}
\tablefirsthead{%
  \hline
  \multicolumn{1}{|c}{{\rmfamily Number}} &
  \multicolumn{1}{c}{{\rmfamily Number$^2$}} &
  {\rmfamily Number$^4$} &
  \multicolumn{1}{c|}{{\rmfamily Number!}} \\
  \hline}
\tablehead{%
  \hline
  \multicolumn{4}{|l|}{\rmfamily\small\sl continued from previous page}\\
  \hline
  \multicolumn{1}{|c}{\rmfamily Number} &
  \multicolumn{1}{c}{\rmfamily Number$^2$} &
  Number$^4$ &
  \multicolumn{1}{c|}{\rmfamily Number!} \\
  \hline}
\tabletail{%
  \hline
  \multicolumn{4}{|r|}{\rmfamily \small\sl continued on next page}\\
  \hline}
\tablelasttail{\hline}
\topcaption{\rmfamily This table is split across pages}
{\ttfamily%
\begin{supertabular}{|r@{\hspace{6.5mm}}|r@{\hspace{5.5mm}}|r|r|}
1   &     1&          1&             1    \\
2   &     4&         16 &            2    \\
3   &     9&         81 &            6    \\
4   &    16 &       256 &           24    \\[5mm]
%...
19 &    361 &    130321 & 1.21645100E+17\\
20 &    400 &    160000 & 2.43290200E+18\\
\end{supertabular}}
\end{center}

\end{document}