Yes. The default maximum number of clan members is 36 but it can be permanently expanded up to 48 players. Any clan member can donate some Au (gold) to their clan and thereby add a portion of progress towards the next milestone. When you pass a milestone, your clan capacity increases by 1. To do this:
- Go to the main clan screen;
- Tap 'Strengthen clan' at the bottom;
- Check how much Au it is required for your clan to increase its capacity;
- If you'd like to donate Au, choose one of the options (200 Au/5000 Au).