Source code for kyu_7.sum_of_triangular_numbers.sum_triangular_numbers

"""
Solution for -> Sum of Triangular Numbers.

Created by Egor Kostan.
GitHub: https://github.com/ikostan
"""




def sum_triangular_numbers(n: int) -> int:
    """
    Return the sum of Triangular Numbers.

    :param n:
    :return:
    """
    if n <= 0:
        return 0

    sum_nums: list = [0]
    for i in range(1, n + 1):
        sum_nums.append(sum_nums[-1] + i)

    return sum(sum_nums)