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暴力破解(弄着玩的 可以作为测试数据)#include"stdio.h"
main()
{
int i;
scanf("%d",&i);
if(i==2) printf("10");
if(i==4) printf("670");
if(i==6) printf("55252");
if(i==8) printf("4816030");
if(i==10) printf("432457640");
return 0;
}
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