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脚注[^R]
[^R]:我是脚注的内容

#include<stdio.h>
int num(int);
int main(void)
{
    int k,i;
    FILE *fp;
    fp=fopen("递归打表.txt","w");
    for(k=2;k<=300;k++)
    {
    i=num(k);
    if(k%2==0)
    printf("f(%d):%d\n",k,i);
    else printf("f(%d):%d\n\n",k,i);
    if(k%2==0)
    fprintf(fp,"f(%d):%d\n",k,i);
    else fprintf(fp,"f(%d):%d\n\n",k,i);
    }
    fclose(fp);
    return 0;
}
int num(int n)
{
    int count=1,i;
    for(i=1;2*i<=n;i++)
    count+=num(i);
    if(n==1)return 1;
    return count;
}

link

\[\mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix}\mathbf{i} & \mathbf{j} & \mathbf{k} \\\frac{\partial X}{\partial u} & \frac{\partial Y}{\partial u} & 0 \\\frac{\partial X}{\partial v} & \frac{\partial Y}{\partial v} & 0 \\\end{vmatrix}\]