  Using the description of enriched $\infty$-operads as associative algebras in
symmetric sequences, we define algebras for enriched $\infty$-operads as
certain modules in symmetric sequences. For $\mathbf{V}$ a nice symmetric
monoidal model category, we prove that strict algebras for $\Sigma$-cofibrant
operads in $\mathbf{V}$ are equivalent to algebras in the associated symmetric
monoidal $\infty$-category in this sense. We also show that
$\mathcal{O}$-algebras in $\mathcal{V}$ can equivalently be described as
morphisms of $\infty$-operads from $\mathcal{O}$ to endomorphism operads of
(families of) objects of $\mathcal{V}$.
