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17 lines
262 B
C++
17 lines
262 B
C++
#include <iostream>
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using namespace std;
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int main()
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{
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int a[41],t,n;
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a[1]=3;a[2]=9;
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for(int i=3;i<=40;i++)
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a[i]=2*a[i-1]+a[i-2];
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cin>>t;
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while(t--)
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{
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cin>>n;
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cout<<a[n]<<endl;
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}
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return 0;
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}
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