https://school.programmers.co.kr/learn/courses/30/lessons/12929
class Solution {
public int solution(int n) {
int[] dp = new int[15];
dp[0] = 1;
dp[1] = 1;
for (int i = 2; i <= n; i++) {
for (int j = 0; j < i; j++) {
dp[i] += (dp[j] * dp[i - j - 1]);
}
}
return dp[n];
}
}