E=13.6/n^2. It's actually E=-13.6/n^2, so the larger the n, the smaller the energy BUT because of the negative value, the energy is actually getting larger. For example, for n=1 it's -13.6 eV but for n=2 it's -3.40 eV (-13.6/2^2, which is -13.6/4). Which is higher? -3.40 eV.