An asymptotic expansion for the Stieltjes constants

The Stieltjes constants ${\gamma }_n$ appear in the coefficients in the Laurent expansion of the Riemann zeta function $\zeta (s)$ about the simple pole $s=1$. We present an asymptotic expansion for ${\gamma }_n$ as $n\to \mathrm{\infty }$ based on the approach described by Knessel and Coffey [Math. Comput. {\bf 80} (2011) 379–386]. A truncated form of this expansion with explicit coefficients is also given. Numerical results are presented that illustrate the accuracy achievable with our expansion.