public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.print("Digite o valor do termo: ");
    int value = scanner.nextInt();

    double answer = 0;
    for(int i = 2; i <= value; i++){
        double topValue = i;
        double bottomValue = (i-1) * (i-1);
        if(i % 2 == 0){
            answer = answer + (topValue / bottomValue);
        } else{
            answer = answer - (topValue / bottomValue);
        }
    }

    System.out.println("O valor do termo é " + answer);
    scanner.close();
}