#include <cstdio>#include <cstring>#include <iostream>#include <string>using namespace std;const int maxn = 200;struct bign {	int len, s[maxn];	bign() {		memset(s, 0, sizeof(s));		len = 1;	}	bign(int num) {		*this = num;	}	bign(const char* num) {		*this = num;	}	bign operator =(int num) { //直接以整数赋值		char s[maxn];		sprintf(s, "%d", num);		*this = s;		return *this;	}	bign operator =(const char* num) { //以字符串赋值		len = strlen(num);		for(int i = 0; i < len; i++)			s[i] = num[len - i - 1] - ‘0‘;		return *this;	}	string str() const { //将bign转化成字符串		string res = "";		for(int i = 0; i < len; i++)			res = (char) (s[i] + ‘0‘) + res;		if(res == "")			res = "0";		return res;	}	bign operator +(const bign& b) const { //重载+号运算		bign c;		c.len = 0;		for(int i = 0, g = 0; g || i < max(len, b.len); i++) {			int x = g;			if(i < len) x += s[i];			if(i < b.len) x += b.s[i];			c.s[c.len++] = x % 10;			g = x / 10;		}		return c;	}	void clean() { //去掉前到0		while(len > 1 && !s[len - 1])			len--;	}	bign operator *(const bign& b) { //重载*号运算		bign c;		c.len = len + b.len;		for(int i = 0; i < len; i++)			for(int j = 0; j < b.len; j++)				c.s[i + j] += s[i] * b.s[j];		for(int i = 0; i < c.len - 1; i++) {			c.s[i + 1] += c.s[i] / 10;			c.s[i] %= 10;		}		c.clean();		return c;	}	bign operator -(const bign& b) { //重载-号运算		bign c;		c.len = 0;		for(int i = 0, g = 0; i < len; i++) {			int x = s[i] - g;			if(i < b.len)				x -= b.s[i];			if(x >= 0)				g = 0;			else {				g = 1;				x += 10;			}			c.s[c.len++] = x;		}		c.clean();		return c;	}	bool operator <(const bign& b) const { //重载<号运算		if(len != b.len)			return len < b.len;		for(int i = len - 1; i >= 0; i--)			if(s[i] != b.s[i])				return s[i] < b.s[i];		return false;	}	bool operator >(const bign& b) const { //重载>号运算		return b < *this;	}	bool operator <=(const bign& b) { //重载<=号运算		return !(b > *this);	}	bool operator ==(const bign& b) { //重载>=号运算		return !(b < *this) && !(*this < b);	}	bign operator +=(const bign& b) { //重载+=号运算		*this = *this + b;		return *this;	}};istream& operator >>(istream &in, bign& x) { //重载输入运算符	string s;	in >> s;	x = s.c_str();	return in;}ostream& operator <<(ostream &out, const bign& x) { //重载输出运算符	out << x.str();	return out;}bign ans[210];void initial(){	ans[2]=1;	ans[4]=2;	for(int i=5;i<=200;i++){		ans[i]=ans[i-2]+ans[i-2];		for(int j=3;j<i;j++){			ans[i]=ans[i]+ans[j-2]*ans[i-j];		}	}}int main(){	initial();	int n;	while(scanf("%d",&n),n!=-1){		cout<<ans[2*n]<<endl;	}	return 0;}