侵刪。

#include <stdio.h>  
#include <string.h>   
int map[20][20],cnt;  
int ans[20] = {0},num,n;  
  
void dfs(int x,int y)  
{  
    if(map[x][y])  
    return ;  
    int i,xx,yy;  
    if(x == n)  
    {  
        num++;  
        return;  
    }  
    xx = x;yy = y;  
    while(xx>0) map[xx--][yy]++;  
    xx = x;yy = y;  
    while(yy>0) map[xx][yy--]++;  
    xx = x;yy = y;  
    while(xx<=n) map[xx++][yy]++;  
    xx = x;yy = y;  
    while(yy<=n) map[xx][yy++]++;  
    xx = x;yy = y;  
    while(xx<=n && yy<=n) map[xx++][yy++]++;  
    xx = x;yy = y;  
    while(xx>0 && yy<=n) map[xx--][yy++]++;  
    xx = x;yy = y;  
    while(xx<=n && yy>0) map[xx++][yy--]++;  
    xx = x;yy = y;  
    while(xx>0 && yy>0) map[xx--][yy--]++;  
  
    for(i=1;i<=n;i++)  
    {  
        dfs(x+1,i);  
	}
    xx = x;yy = y;  
    while(xx>0) map[xx--][yy]--;  
    xx = x;yy = y;  
    while(yy>0) map[xx][yy--]--;  
    xx = x;yy = y;  
    while(xx<=n) map[xx++][yy]--;  
    xx = x;yy = y;  
    while(yy<=n) map[xx][yy++]--;  
    xx = x;yy = y;  
    while(xx<=n && yy<=n) map[xx++][yy++]--;  
    xx = x;yy = y;  
    while(xx<=n && yy>0) map[xx++][yy--]--;  
    xx = x;yy = y;  
    while(xx>0 && yy<=n) map[xx--][yy++]--;  
    xx = x;yy = y;  
    while(xx>0 && yy>0) map[xx--][yy--]--;  
}  
  
void set()  
{  
    int i,j;  
    for(i = 1;i<=10;i++)  
    {  
        num = 0;n = i;  
        for(j = 1;j<=i;j++)  
        {  
            memset(map,0,sizeof(map));  
            dfs(1,j);  
        }  
        ans[i] = num;  
    }  
}  
  
int main()  
{  
    set();  
    while(~scanf("%d",&n),n)  
    {  
        printf("%d\n",ans[n]);  
    }  
  
    return 0;  
}