\begin{tikzpicture}[
    squarednode/.style={rectangle, draw=black!60, fill=white!5, very thick, minimum size=5mm},
    ]
    
    \node[squarednode] at (0,1) (int1) {1};
    \node[squarednode] at (0,1.5) (int1) {2};
    \node[squarednode] at (0.5,1) (int1) {3};
    \node[squarednode] at (0.5,1.5) (int1) {2};
    \node[squarednode] at (1,1) (int1) {4};
    \node[squarednode] at (1,1.5) (int1) {3};
    
    \node[squarednode] at (2,1) (int1) {1};
    \node[squarednode] at (2,1.5) (int1) {2};
    \node[squarednode] at (2.5,1) (int1) {2};
    \node[squarednode] at (2.5,1.5) (int1) {4};
    \node[squarednode] at (3,1) (int1) {2};
    \node[squarednode] at (3,1.5) (int1) {4};
    
    \node[squarednode] at (4,1) (int1) {1};
    \node[squarednode] at (4,1.5) (int1) {2};
    \node[squarednode] at (4.5,1) (int1) {3};
    \node[squarednode] at (4.5,1.5) (int1) {5};
    \node[squarednode] at (5,1) (int1) {4};
    \node[squarednode] at (5,1.5) (int1) {6};
    \end{tikzpicture}