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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long t,a,c,d,e,f,i,j,k,l,m,n;
- scanf("%lld",&t);
- while(t--)
- {
- c=0;
- d=0;
- scanf("%lld",&a);
- for(i=1;i<=a;i++)
- {
- if(i<a/2 || i==a)
- {
- c+=pow(2,i);
- }
- else
- {
- d+=pow(2,i);
- }
- }
- printf("%lld\n",abs(c-d));
- }
- return 0;
- }
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