Перемножение факториалов

function factorialProduct(n) { 
  var res = 1; 
  for (var i = 1, k = 1; i <= n; i++, k = k * i) 
    res = res * k; 
  return res; 
} 
console.log(factorialProduct(3)); 
console.log(factorialProduct(4)); 
console.log(factorialProduct(5)); 
console.log(factorialProduct(6)); 
console.log(factorialProduct(10));