
    In a city's delivery fleet system that uses hexagonal service zones radiating outward from a central distribution hub, determine the total number of delivery points that can be serviced within the nth zone, where each zone forms a hexagonal pattern around the previous zone. The number of delivery points in each zone follows a centered hexagonal sequence, helping dispatchers optimize route assignments based on traffic density and weather conditions.
    

    
def centered_hexagonal_number(n):
    """
    In a city's delivery fleet system that uses hexagonal service zones radiating outward from a central distribution hub, determine the total number of delivery points that can be serviced within the nth zone, where each zone forms a hexagonal pattern around the previous zone. The number of delivery points in each zone follows a centered hexagonal sequence, helping dispatchers optimize route assignments based on traffic density and weather conditions.
    

    """
def centered_hexagonal_number(n):
    """
    In a city's delivery fleet system that uses hexagonal service zones radiating outward from a central distribution hub, determine the total number of delivery points that can be serviced within the nth zone, where each zone forms a hexagonal pattern around the previous zone. The number of delivery points in each zone follows a centered hexagonal sequence, helping dispatchers optimize route assignments based on traffic density and weather conditions.
    

    """
    return 3 * n * (n - 1) + 1