import matplotlib.pyplot as plt
def u(n):
	return 0.2*n**2-1.2*n+1.6
def suite_recurrente(u,debut,fin,u_p):
    liste_x=[debut]
    liste_y=[u_p]
    for i in range(debut,fin):
        liste_x.append(i+1)
        liste_y.append(u(liste_y[i]))
    plt.scatter(liste_x,liste_y)
    plt.grid()
    plt.show()
    return liste_y