
    Given a vehicle maintenance level n, calculate the total number of sensor inspection points required, where each new level adds inspection points in a three-dimensional pattern across vehicle systems, components, and time intervals, with the pattern following tetrahedral stacking. The total number of inspection points at any level n represents the cumulative sum of all points from level 1 to n, accounting for the increasing complexity of maintenance requirements as systems interconnect.
    

    
def tetrahedral_number(n):
    """
    Given a vehicle maintenance level n, calculate the total number of sensor inspection points required, where each new level adds inspection points in a three-dimensional pattern across vehicle systems, components, and time intervals, with the pattern following tetrahedral stacking. The total number of inspection points at any level n represents the cumulative sum of all points from level 1 to n, accounting for the increasing complexity of maintenance requirements as systems interconnect.
    

    """
def tetrahedral_number(n):
    """
    Given a vehicle maintenance level n, calculate the total number of sensor inspection points required, where each new level adds inspection points in a three-dimensional pattern across vehicle systems, components, and time intervals, with the pattern following tetrahedral stacking. The total number of inspection points at any level n represents the cumulative sum of all points from level 1 to n, accounting for the increasing complexity of maintenance requirements as systems interconnect.
    

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