fn fibonacci(n: usize) -> Vec<usize> {
    let mut f = (1, 1);
    let mut fibo = vec![1, 1];

    let calc = |_| {
        f = (f.1, f.0 + f.1);
        fibo.push(f.1);
    };

    if n > 2 {
        (0..n - 2).for_each(calc);
    }

    fibo
}