I was curious about the general Faulhaber's formula which states according to wiki

$\displaystyle \sum_{k=1}^{n}k^p = \frac{1}{p+1}\sum_{j=0}^{p}(-1)^j \left( \begin{matrix} p + 1\\ j\end{matrix}\right)B_{j}n^{p+1-j},$ where $\displaystyle B_{1 = -\frac{1}{2}$

Unfortunately, I don't understand $\displaystyle \left( \begin{matrix} p + 1\\ j\end{matrix}\right)$. Is that a vector?