Riordan Matrix Representations of Euler's Constant $\gamma$ and Euler's   Number $e$
  We show that the Euler-Mascheroni constant $\gamma$ and Euler's number $e$ can both be represented as a product of a Riordan matrix and certain row and column vectors. 
Edray Herber Goins, Asamoah Nkwanta
math.CO math.RT