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math.CO2020
A combinatorial bijection on di-sk trees
Shishuo Fu, Zhicong Lin, Yaling Wang
A di-sk tree is a rooted binary tree whose nodes are labeled by or , and no node has the same label as its right child. The di-sk trees are in natural bijection w…
math.CO2020★ 1 cited
Refined Wilf-equivalences by Comtet statistics
Shishuo Fu, Zhicong Lin, Yaling Wang
We launch a systematic study of the refined Wilf-equivalences by the statistics and , where and are the number of…