Its not passing Test Case 0. What's the problem. All other 4 test cases are passed

#1

n = int(input())

if n==2:
print(1)
else:
ans = 1;
for i in range (2,n+1):
ans = ans*(n+i)/i
print(int(ans))

#2

@kunaljindal for 2 answer is 2, for 1 answer is 1.

#3

@kunaljindal you program will fail for every odd number as then n+2 will be odd and dividing by 2 will lead to loss in data.
For using this formula you can use two variable to store the demon and numerator separately, or you can use dp/recursion or you do one thing modify the expression to:

for i in range (2,n+1):
        ans = (ans*(2*n+2-i))/i
#4

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