
public class Main {
    public static void main(String[] args) {
        for (int i = 1; i < 100; i++) {
            if (i % 2 == 0) // 填空 //i%2==0偶数项
                System.out.println(i * i / 2);
            else// 奇数项
                System.out.println((i * i - 1) / 2);
        }
    }
}