Demonstratio insignis theorematis numerici circa uncias potestatum   binomialium
  This paper is about the product z^q/(1 - z)^(q + 1)(1 + (z/(1 - z)))^p, Euler gives the Talylor-Series and takes a closer look at the coefficient. 
Leonhard Euler, Artur Diener, Alexander Aycock
math.HO