func sign(n int) {
fmt.Println(factorial(n) * (1 << uint8(n)))
a := make([]int, n)
for k := range a {
a[k] = k + 1
}
signPerm(a)
for permutable.NextPermutation(permutable.PermInts(a)) {
signPerm(a)
}
}
func Perm() {
n := 0
if _, err := fmt.Scanf("%d", &n); err != nil {
log.Fatal(err)
}
fmt.Println(factorial(n))
a := make([]int, n)
for k := range a {
a[k] = k + 1
}
printPerm(a)
for permutable.NextPermutation(permutable.PermInts(a)) {
printPerm(a)
}
}