TribonacciSequence with BigInteger

package MethodsMoreExercises;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

public class TribonacciSequenceBigInteger {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());
        printTribonacciSequence(num);
    }

    private static void printTribonacciSequence(int num) {

        BigInteger[] sequenceArr = new BigInteger[0];

        for (int i = 0; i < num; i++) {

            if (i < 2) {
                sequenceArr = Arrays.copyOf(sequenceArr, i + 1);
                sequenceArr[i] = BigInteger.ONE;

            } else if (i == 2) {
                sequenceArr = Arrays.copyOf(sequenceArr, i + 1);
                sequenceArr[i] = BigInteger.TWO;

            } else {
                sequenceArr = Arrays.copyOf(sequenceArr, i + 1);
                sequenceArr[i] = sequenceArr[i] = sequenceArr[i - 1].add(sequenceArr[i - 2]).add(sequenceArr[i - 3]);

            }
            System.out.print(sequenceArr[i] + " ");
        }
    }
}