%\tikzstyle{num} = [rectangle, minimum width = 0.6cm, minimum height = 0.6cm, text centered,align=center,thick,draw = black, fill = black!8] \tikzstyle{num} = [rectangle, minimum width = 0.6cm, minimum height = 0.6cm, text centered,align=center,thick,draw = black,rounded corners=1.5pt] \begin{tikzpicture}[node distance = 0cm] \node(num1)[num]{\textbf1}; \node(num2)[num,right of = num1,xshift = 1.2cm]{\textbf{\textcolor{blue!70}2}}; \node(num3)[num,right of = num2,xshift = 1.2cm]{\textbf{\textcolor{blue!70}3}}; \node(num4)[num,right of = num3,xshift = 1.2cm]{\textbf{\textcolor{blue!70}4}}; \node(num5)[num,right of = num4,xshift = 1.2cm]{\textbf{\textcolor{blue!70}5}}; \node(num6)[num,right of = num5,xshift = 1.2cm]{\textbf{\textcolor{blue!70}6}}; \node(num7)[num,right of = num6,xshift = 1.2cm]{\textbf{\textcolor{blue!70}7}}; \node(num8)[num,right of = num7,xshift = 1.2cm]{\textbf{\textcolor{blue!70}8}}; \node(num9)[num,right of = num8,xshift = 1.2cm]{\textbf9}; \node(A)[below of = num2,yshift = -0.6cm]{A}; \node(B)[below of = num8,yshift = -0.6cm]{B}; \draw [->, thick, color = blue!80](num2.east)--(num3.west); \draw [->, thick, color = blue!80](num3.east)--(num4.west); \draw [->, thick, color = blue!80](num4.east)--(num5.west); \draw [->, thick, color = blue!80](num5.east)--(num6.west); \draw [->, thick, color = blue!80](num6.east)--(num7.west); \draw [->, thick, color = blue!80](num7.east)--(num8.west); \end{tikzpicture}