documentclass[1pt, pdf, svgnames]{standalone}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage{fourier}
usepackage{pstricks-add}
usepackage{xcolor}

begin{document}

begin{pspicture}(-1,-4)(4,6)
psset{radius = 0.15, xunit = 2cm, yunit = 1.2cm, fillstyle = solid}
psaxes[yaxis = false, linewidth = 0pt,linecolor = white, ticks = none](0,-3.9)(2,-3.9)
uput[d](-1,-4){Time step}
Cnode(0,0){O}
pnodes{A}(1,-2.4)(1,-1.9)(1, -1.4)(1, -0.9)(1,-0.4)(1,0.4)(1, 0.9)(1, 1.4)(1,1.9)(1,2.4)
pnodes{B}(2,-3.8)(2,-3.3)(2, -2.8)(2, -2.3)(2,-1.8)(2,-1)(2, -0.5)(2, 0)(2,0.5)(2,1)(2,1.8)(2, 2.3)(2, 2.8)(2,3.3)(2,3.8)
Cnode(O){} multido{i = 0 + 1}{10}{Cnode[fillcolor =LightSteelBlue ](Ai){Ci}}
multido{i = 2 + 5}{2}{Cnode[fillcolor = white](Ai){}}
multido{i = 0 + 1}{15}{Cnode(Bi){Di}}
multido{i = 0 + 1}{10}{ncline{Ci}{Di}fpAdd{i}{5}{j}ncline{Ci}{Dj}}%
ncline{O}{C2}ncline{O}{C7}
psset{linestyle = dashed}
multido{i = 0 + 1}{10}{ncline{O}{Ci}}%
end{pspicture}

end{document}