#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <set>
#include <map>
#include <iomanip>
#include <cassert>
#include <stack>
#include <queue>
#include <deque>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef pair <int, int> pii;

// template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//  order_of_key (k) : Number of items strictly smaller than k .
//  find_by_order(k) : K-th element in a set (counting from zero).
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define pb push_back
#define ppb pop_back
#define mkp make_pair
#define F first
#define S second
#define show(a) cerr << #a <<" -> "<< a <<"\n"
#define fo(a, b, c, d) for(int (a) = (b); (a) <= (c); (a) += (d))
#define foo(a, b, c ,d) for(int (a) = (b); (a) >= (c); (a) -= (d))
//#define int ll

const int N = 2e5 + 5;
const int oo = 1e9 + 5;

int n;
ll ans;
string s;//, r, b;
map <pair<string, int>, int> cnt;
bool u[100];

void go (int pos) {
	if (pos == n + 1) {
		string r = "", b = "";
		int ct = 0;
		for (int i = 1; i <= n; ++i) {
			if (u[i]) {r.pb(s[i]); ++ct;}
		}
		for (int i = n; i >= 1; --i) {
			if (!u[i]) b.pb(s[i]);
		} 
		++cnt[mkp(r + b, ct)];
		return;
	}
	u[pos] = 1;
	go(pos + 1);
	u[pos] = 0;
	
	go(pos + 1);
}

void go2 (int pos) {
	if (pos == 2 * n + 1) {
		string r = "", b = "";
		int ct = 0;
		for (int i = n+1; i <= 2*n; ++i) {
			if (u[i]) {r.pb(s[i]); ++ct;}
		}
		for (int i = 2*n; i >= n+1; --i) {
			if (!u[i]) b.pb(s[i]);
		} 
		ans += cnt[mkp(b + r, n-ct)];
		return;
	}
	u[pos] = 1;
	go2(pos + 1);
	u[pos] = 0;
	
	go2(pos + 1);
}
void solve() {
	cin >> n;
	cin >> s;
	s = '#' + s;
	go(1);
	go2(n + 1);
	cout << ans;
}

 main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tt = 1;
	while (tt --) {
		solve();
	}
	return 0;
}
/*
	“I’m not gonna run away, I never go back on my word! That’s my nindo: my ninja way.” Naruto

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Measured memory_bytes: 70656