
    Design a function that calculates the total number of writing evaluation criteria points for any given assessment level in the automated writing feedback system, where each level adds a triangular layer of new criteria points across grammar, structure, and content dimensions. The system follows a tetrahedral progression pattern, meaning that for any level n, the total evaluation points form a tetrahedral number that considers the cumulative assessment criteria from all previous levels plus the new three-dimensional layer of criteria points added at the current level.
    

    
def tetrahedral_number(n):
    """
    Design a function that calculates the total number of writing evaluation criteria points for any given assessment level in the automated writing feedback system, where each level adds a triangular layer of new criteria points across grammar, structure, and content dimensions. The system follows a tetrahedral progression pattern, meaning that for any level n, the total evaluation points form a tetrahedral number that considers the cumulative assessment criteria from all previous levels plus the new three-dimensional layer of criteria points added at the current level.
    

    """
def tetrahedral_number(n):
    """
    Design a function that calculates the total number of writing evaluation criteria points for any given assessment level in the automated writing feedback system, where each level adds a triangular layer of new criteria points across grammar, structure, and content dimensions. The system follows a tetrahedral progression pattern, meaning that for any level n, the total evaluation points form a tetrahedral number that considers the cumulative assessment criteria from all previous levels plus the new three-dimensional layer of criteria points added at the current level.
    

    """
    return n * (n + 1) * (n + 2) / 6