  We introduce a family of generalized Schr\"oder polynomials $S_\tau(q,t,a)$,
indexed by triangular partitions $\tau$ and prove that $S_\tau(q,t,a)$ agrees
with the Poincar\'e series of the triply graded Khovanov-Rozansky homology of
the Coxeter knot $K_\tau$ associated to $\tau$. For all integers $m,n,d\geq 1$
with $m,n$ relatively prime, the $(d,mnd+1)$-cable of the torus knot $T(m,n)$
appears as a special case. It is known that these knots are algebraic, and as a
result we obtain a proof of the $q=1$ specialization of the
Oblomkov-Rasmussen-Shende conjecture for these knots. Finally, we show that our
Schr\"oder polynomial computes the hook components in the Schur expansion of
the symmetric function appearing in the shuffle theorem under any line, thus
proving a triangular version of the $(q,t)$-Schr\"oder theorem.
