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  1. or download this
    @n = map { $n + 1 - $_, $_ } 1 .. $n / 2;
  2. or download this
    use integer;
@n = map { $n + 1 - $_, $_ } 1 .. $n / 2;
push @n, $n / 2 + 1 if $n % 2;
  3. or download this
    @n = map { $n + 2 - 2 * $_, 2 * $_ - 1, 2 * $_, $n + 1 - 2 * $_ } 1 ..
+ $n / 4;