  /* integer sequence of values
   * Args: 
   *   start: starting integer
   *   end: ending integer
   * Returns: 
   *   an integer sequence from start to end
   */ 
  int[] sequence(int start, int end) { 
    int seq[end - start + 1];
    for (n in 1:num_elements(seq)) {
      seq[n] = n + start - 1;
    }
    return seq; 
  } 
