  We recall the main types of lattice paths, which are sequences in the lattice
of integer coordinates points in the plane. We start with the fundamental
central lattice paths and Dyck paths and proceed in elementary terms through
recently introduced lattice paths.
  For every type, we consider the respective generating function. In fact,
through our approach (via Riordan arrays), various entries of the On-Line
Encyclopedia of Integer Sequences are unified, clarified, and simplified.
