fcn topswops(n){
   flip:=fcn(xa){
      if (not xa[0]) return(0);
      xa.reverse(0,xa[0]+1);  // inplace, ~4x faster than making new lists
      return(1 + self.fcn(xa));
   };
   (0).pump(n,List):Utils.Helpers.permute(_).pump(List,"copy",flip).reduce("max");
}

foreach n in ([1 .. 10]){ println(n, ": ", topswops(n)) }