function [x,y]=limiti(esempio)

clf;

% esempio=12;

switch esempio
    
    case 1
        
        n=0:10;
        x=0:0.5:10;
        
        % an=n.^2;
        an=(-2).^n;
        
        hold on;
        plot(n,an,'ko','MarkerEdgeColor','k','MarkerFaceColor','k');
        % plot(x,zeros(size(x)),'k.','LineWidth',1);
        hold off;
        
end