\documentclass{standalone}

\usepackage{tikz}
\usepackage{shapes}

\begin{document}
\begin{tikzpicture}
  \grid{16}{16}{(-8,-8)}

  \square{sequential4-4}{(2,2)}
  \square{sequential4-4}{(0,3)}
  \square{sequential4-4}{(-3,1)}
  \square{sequential4-4}{(-2,-2)}
  \square{sequential4-4}{(0,-3)}
  \square{sequential4-4}{(3,-1)}

  \disk{sequential4-1}{(0,0)}

  \disk{sequential4-3}{(5,1)}
  \disk{sequential4-3}{(2,5)}
  \disk{sequential4-3}{(-3,4)}
  \disk{sequential4-3}{(-5,-1)}
  \disk{sequential4-3}{(-2,-5)}
  \disk{sequential4-3}{(3,-4)}

\end{tikzpicture}
\end{document}