  We describe a type of n-point function associated to strongly regular vertex
operator algebras V and their irreducible modules. Transformation laws with
respect to the Jacobi group are developed for 1-point functions. For certain
elements in V, the finite-dimensional space spanned by the corresponding
1-point functions for the inequivalent irreducible modules is shown to be a
vector-valued weak Jacobi form. A decomposition of 1-point functions for
general elements is proved, and shows that such functions are typically
quasi-Jacobi forms. Zhu-type recursion formulas are proved; they show how an
n-point function can be written as a linear combination of (n-1)-point
functions with coefficients that are quasi-Jacobi forms.
