use std::io::{Read, stdin};
use std::collections::HashMap;

fn main() {
    let mut buf = String::new();
    stdin().read_to_string(&mut buf).unwrap();
    let mut tok = buf.split_whitespace();
    let mut get = || tok.next().unwrap();
    macro_rules! get {
        ($t:ty) => (get().parse::<$t>().unwrap());
        () => (get!(i64));
    }
    let m = 1000000007;
    let n = get!();
    
    let mut h = HashMap::new();
    h.insert((n, n), 1);
    for _ in 0..2*n {
        let mut t = HashMap::new();
        for (&(p, b), c) in h.iter() {
            if p > 0 {
                t.insert((p - 1, b), c * p % m);
            }
            if p != b {
                t.insert((p, b - 1), c * (2 * n - p - b) * b % m);
            }
        }
        h = t;
    }
    println!("{}", h.get(&(0,0)).unwrap());
}