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  A simple proof of an identity of Lacasse  A simple proof of an identity of Lacasse  Official source
• The Electronic Journal of Combinatorics Volume 21, Issue 1 (2014) - Papers
  Some New Binomial Sums Related to the Catalan Triangle
  Abstract  PDF  Some new binomial sums related to the Catalan triangle  Some new binomial sums related to the Catalan triangle  Official source