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public class Main {
	public static void main(String[] paramArrayOfString) {
		collatz(23);
	}

	static void collatz(int n) {
		if (n == 1) {
			System.out.println("Basisfall");
		} else {
			if (n % 2 == 0)
				collatz(n / 2);
			else
				collatz(3 * n + 1);
		}
		System.out.println(n);
	}
}

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Basisfall
1
2
4
8
16
5
10
20
40
80
160
53
106
35
70
23