I have a question of "rrt_star.py" in rrt_2D.

[guest-oo]

def find_near_neighbor(self, node_new):
n = len(self.vertex) + 1
r = min(self.search_radius * math.sqrt((math.log(n) / n)), self.step_len)
dist_table = [math.hypot(nd.x - node_new.x, nd.y - node_new.y) for nd in self.vertex]
dist_table_index = [ind for ind in range(len(dist_table)) if dist_table[ind] <= r and
not self.utils.is_collision(node_new, self.vertex[ind])]
return dist_table_index

Is this n plus 1 in the code correct?