u , v = [5,3] , [2,4]

for i in range(2,21):
    u.append( 2 * u[i-2] + 3 * u[i-1] )
    v.append( v[i-2] / v[i-1] + u[i] / u[i-1] )
    print('u(',i,') =',u[i],' ; v(',i,') =',v[i])