38 lines
674 B
C++
38 lines
674 B
C++
#include<iostream>
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#include<string.h>
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#include<cmath>
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#include<cstring>
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#include<cstdlib>
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#include<algorithm>
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using namespace std;
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__int64 a[30][30];
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int main()
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{
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int i,j;
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int t,n;
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__int64 sum;
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memset(a,0,sizeof(a));
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a[1][1]=1;
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for(i=2;i<26;i++)
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{
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for(j=1;j<=i;j++)
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{
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a[i][j]=a[i-1][j-1]+a[i-1][j]*j;
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}
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}
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while(~scanf("%d",&t))
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{
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while(t--)
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{
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scanf("%d",&n);
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sum=0;
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for(i=1;i<=n;i++)
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{
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sum+=a[n][i];
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}
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printf("%I64d\n",sum);
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}
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}
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return 0;
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}
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