\begin{equation*}
\footnotesize
\newcommand\orangeint[1]{
\textcolor{orange}{\mathbf #1}
}
\newcommand\grayint[1]{
\textcolor{black}{\mathbf #1}
}
 \begin{array}{lcccccccccccccccccccccccc}
&&&\grayint{1}
&&\grayint{1}
&&\grayint{1}
&&\grayint{1}
&&\orangeint{1}
&&\grayint{1}
&&\grayint{1}&& \cdots\\[4pt]
\text{Row $2$}
&&\cdots&&\grayint{3}
&&\grayint{1}
&&\grayint{2}
&&\orangeint{2}
&&\orangeint{1}
&&\grayint{3}
&&\grayint{1}&&
 \\[4pt] % row 3
&&&\orangeint{2}
&&\grayint{2}
&&\grayint{1}
&&\orangeint{3}
&&\orangeint{1}
&&\orangeint{2}
&&\grayint{2}
&&\cdots&\
 \\[4pt] % row 4
&&\cdots
&&\orangeint{1}
&&\grayint{1}
&&\orangeint{1}
&&\orangeint{1}
&&\orangeint{1}
&&\orangeint{1}
&&\grayint{1}&&
\end{array}
\end{equation*}