
    Design a function for an automated grading system that calculates the total number of points a student should earn at any given assessment level n, where points follow a decagonal pattern to test understanding of geometric sequences. The assessment system awards points based on the nth decagonal number to ensure progressive difficulty and comprehensive evaluation of student comprehension.
    

    
def is_num_decagonal(n):
    """
    Design a function for an automated grading system that calculates the total number of points a student should earn at any given assessment level n, where points follow a decagonal pattern to test understanding of geometric sequences. The assessment system awards points based on the nth decagonal number to ensure progressive difficulty and comprehensive evaluation of student comprehension.
    

    """
def is_num_decagonal(n):
    """
    Design a function for an automated grading system that calculates the total number of points a student should earn at any given assessment level n, where points follow a decagonal pattern to test understanding of geometric sequences. The assessment system awards points based on the nth decagonal number to ensure progressive difficulty and comprehensive evaluation of student comprehension.
    

    """
    return 4 * n * n - 3 * n