We find a layered permutation $w\in S_n$ whose Schubert polynomial $\mathfrak S_w(x_1, \dots, x_n)$ has support of size asymptotically at least $n!/4^n$. This gives precise asymptotics for the growth rate of $\beta(n):= \max_{ w\in S_n}|\mathrm{ supp}(\mathfrak S_w)|$. We find a different layered permutation $w\in S_n$ whose Grothendieck polynomial has support of size asymptotically at least $n!/e^{ \sqrt{ 2n} \cdot \ln(n)}$ and obtain more precise asymptotics for the growth rate of $\beta^{ \mathfrak G}(n):=\max_{ w\in S_n}|\mathrm{ supp}(\mathfrak G_w)|$.
Categories: math.CO