n <= 0 : 1
Hn(x) = n = 1 : 2x
n >= 2 : 2xHn-1(x) - 2(n -1)Hn-2(x)
#include<stdio.h>
int hermite(int n, int x)
{
if(n <= 0)
return 1;
else if(1 == n)
return 2*x;
else
return 2 * x * hermite(n-1, x) - 2 * (n-1) * hermite(n-2, x);
}
int main()
{
int h = hermite(1,2);
printf("%d\n",h);
return 0;
}