Sun, Yidong

• The Electronic Journal of Combinatorics Volume 17 (2010) - Research Papers
  $\lambda$-Factorials of $n$
  Abstract  PDF
• The Electronic Journal of Combinatorics Volume 17 (2010) - Notes
  A Simple Bijection between Binary Trees and Colored Ternary Trees
  Abstract  PDF
• The Electronic Journal of Combinatorics Volume 20, Issue 2 (2013) - Papers
  A Simple Proof of an Identity of Lacasse
  Abstract  PDF
• The Electronic Journal of Combinatorics Volume 21, Issue 1 (2014) - Papers
  Some New Binomial Sums Related to the Catalan Triangle
  Abstract  PDF