C语言计算s=1+1*3+1*3*5+1*3*5*7+1*3*5*7*9用循环语句怎么做啊?

#include
void main()
{
int i,j,t;
int s=0;
for(i=0;i0;j=j-2)
t*=j;
s+=t;
}
printf("Result is %d\n",s);
}