Simple Pascal's triangle in Scala

PascalTriangle.scala

object PascalTriangle extends App {
  def triangle(n: Int) {
    def nextList(l: List[Int]) : List[Int] =
      if(l.length > 1) 1 +: l.sliding(2).toList.map{_.reduce{_+_}} :+ 1
      else List(1,1)
    val (result,_) = (n-1 to 0 by -1).foldLeft("",List(1)) {
      case ((str,lst),space) => (str + " "*space + lst.mkString(" ") + "\n",nextList(lst))
    }   
    print(result)
  }
  triangle(args(0).toInt)
}