To generate tables, use the tabular environment. For example,
\begin{center}
\begin{tabular}{c|ccccccc|}
$\lambda$& (5)& (4,1)& (3,2)& (3,1,1)& (2,2,1)& (2,1,1,1)&
(1,1,1,1,1)\\
\hline
$d_{_\lambda}$& 1& 4& 5& 6& 5& 4& 1\\
\end{tabular}
\end{center}
generates
 | (5) | (4,1) | (3,2) | (3,1,1) | (2,2,1) | (2,1,1,1) | (1,1,1,1,1) |
 | 1 | 4 | 5 | 6 | 5 | 4 | 1 |
{c|ccccccc|} describes the layout of the table.
The 8 c's specify that the table has 8 columns, and the
entries in each column are to be centered.
You can also use
l and r to make columns in which the entries
are, respectively, left- and right-justified.
The vertical bar
characters, |, indicate that there are to be vertical
lines between the first and second columns, and after the
eighth. The table is enclosed in a center
environment to center the table as a whole on the page.
The text of the table itself appears after the string
specifying the column layout. Entries in the table are
separated by the ampersands &, and each row is ended
with a carriage return command, \\ . The
\hline command produces a horizontal line which runs
the width of the table. The tabular environment and its relatives can
be used to produce some pretty sophisticated tables; consult the
references for more information.