UVA - 991 - Safe Salutations (Java Solution)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        String m="";
        BigInteger []catlan=new BigInteger[11];
        BigInteger []fact=new BigInteger[21];
        fact[0]=BigInteger.ONE;
        fact[1]=BigInteger.ONE;
        for(int i=2;i<fact.length;i++){
            fact[i]=fact[i-1].multiply(BigInteger.valueOf(i));
        }
        sb.append('{');
        for(int i=0;i<catlan.length;i++){
            catlan[i]=fact[2*i].divide(fact[i+1].multiply(fact[i]));
            if(i>0)
                 sb.append(',');
            sb.append(catlan[i]);
        }
        sb.append('}');
        int i=0;
        System.out.print(sb);
    }

}