
    Given a central distribution hub with expanding hexagonal delivery zones, calculate the total number of delivery points that can be serviced when the fleet coverage extends to n concentric zones around the hub. Each new zone forms a hexagonal ring that builds upon previous zones, following a centered hexagonal pattern to ensure optimal route distribution.
    

    
def centered_hexagonal_number(n):
    """
    Given a central distribution hub with expanding hexagonal delivery zones, calculate the total number of delivery points that can be serviced when the fleet coverage extends to n concentric zones around the hub. Each new zone forms a hexagonal ring that builds upon previous zones, following a centered hexagonal pattern to ensure optimal route distribution.
    

    """
def centered_hexagonal_number(n):
    """
    Given a central distribution hub with expanding hexagonal delivery zones, calculate the total number of delivery points that can be serviced when the fleet coverage extends to n concentric zones around the hub. Each new zone forms a hexagonal ring that builds upon previous zones, following a centered hexagonal pattern to ensure optimal route distribution.
    

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