$$\prod_{j\ge0}\biggl(\sum_{k\ge0}a_{jk}z^k\biggr)
  =\sum_{n\ge0}z^n\,\Biggl(\sum_
    {\scriptstyle k_0,k_1,\ldots\ge0\atop
    \scriptstyle k_0+k_1+\cdots=n}
    a_{0k_0}a_{1k_1}\ldots\,\Biggr).$$