I'm familiar with Faulhaber's formula to express this sum as a much simpler one, but it appears that for any $p$ there's a product formula in $n$ for the sum e.g.:
$$\begin{align} & \sum\limits_{k=1}^{n} k^1=\frac{n(n+1)}{2} \\ & \sum\limits_{k=1}^{n} k^2=\frac{n(n+1)(2n+1)}{6} \\ & \sum\limits_{k=1}^{n} k^3=\frac{n^2(n+1)^2}{4} \end{align}$$
...and so forth. Is there a general product formula in $p$ and $n$ for this sum?