...#tex2html_wrap_inline687#1
By considering the effects of the trapezoid rule on $\int_0^\infty e^{-sx}\,dx$, you should be able to convince yourself that $C_n$ is equal to the numerical prefactor of the $h^n$ term in the power series expansion for $h\left(1/2+1/(e^{sh}-1)\right)$.
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