  In this paper we compute the subgroup zeta functions of nilpotent semi-direct
products of groups of the form
  $$G_n=<x_1,...,x_n,y_1,...,y_{n-1}|[x_i,x_n]=y_i, 1\leq i\leq n-1, \text{all
other $[,]$ trivial}>$$
  and deduce local functional equations.
