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#include<stdio.h>
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#include<string.h>
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int main()
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{
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int n,i,f[1000]={4},a;
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scanf("%d",&n);
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while(n--)
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{
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memset(f,0,sizeof(f));
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f[0]=4;
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scanf("%d",&a);
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if(a==1)
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printf("4\n");
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else
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{
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for(i=1;i<a;i++)
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{
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f[i]=(f[i-1]-1)*2;
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}
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printf("%d\n",f[a-1]);
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}
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}
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return 0;
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}
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