  Let $\mathrm{JT}_\lambda$ be the Jacobi-Trudi matrix corresponding to the
partition $\lambda$, so $\det\mathrm{JT}_\lambda$ is the Schur function
$s_\lambda$ in the variables $x_1,x_2,\dots$. Set $x_1=\cdots=x_n=1$ and all
other $x_i=0$. Then the entries of $\mathrm{JT}_\lambda$ become polynomials in
$n$ of the form ${n+j-1\choose j}$. We determine the Smith normal form over the
ring $\mathbb{Q}[n]$ of this specialization of $\mathrm{JT}_\lambda$. The proof
carries over to the specialization $x_i=q^{i-1}$ for $1\leq i\leq n$ and
$x_i=0$ for $i>n$, where we set $q^n=y$ and work over the ring
$\mathbb{Q}(q)[y]$.
