Shuffle Squares and Reverse Shuffle Squares

Xiaoyu He, Emily Huang, Ihyun Nam +1

Let ${\mathcal{SS}}_k(n)$ be the family of {\it shuffle squares} in $[k{]}^{2n}$, words that can be partitioned into two disjoint identical subsequences. Let ${\mathcal{R}\mathcal{SS}}_k(n)$ be th…