I am new to latex and I'm quite unable to figure out how to achieve this:
So far I have done this:
\documentclass[10pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{tabularx,ragged2e,booktabs,caption}
\begin{document}
\begin{table}[ht]
\caption {Dataframe} \label{tab:title}
\centering
\begin{tabular}{rllll}
\hline
& a & b & c & d \\
\hline
1 & $a_1$ & $b_1$ & $c_1$ & $d_1$ \\
2 & $a_2$ & $b_2$ & $c_2$ & $d_2$ \\
3 & $a_3$ & $b_3$ & $c_3$ & $d_3$ \\
4 & . & . & . & . \\
5 & . & . & . & . \\
6 & $a_n$ & $b_n$ & $c_n$ & $d_n$ \\
\hline
\end{tabular}
\end{table}
\end{document}