4(e4−1)4\left(e^{4}-1\right)4(e4−1)
15(e5−1)\frac{1}{5}\left(e^{5}-1\right)51(e5−1)
5(e5−1)5\left(e^{5}-1\right)5(e5−1)
14(e4−1)\frac{1}{4}\left(e^{4}-1\right)41(e4−1)