View Compilation Error

0_0_5519264_21359\Main.java:14: cannot find symbol
symbol  : variable n
location: class Main
            ans1[i] = ans1[i - 1].multiply(BigInteger.valueOf(2*n-1));
                                                                ^
0_0_5519264_21359\Main.java:15: cannot find symbol
symbol  : variable n
location: class Main
            ans2[i] = ans2[i - 1].multiply(BigInteger.valueOf(2*n));
                                                                ^
2 errors