50 Nodes = 1 Round
17 Rounds = 850 Nodes

2 cells per node,

If you plan to use gems for the Rounds the cost is for 17 rounds is 29,500 Gems,
You get 1.7k Cells (2 per node)
Each Round Increases the gem Cost:
Round 1: 10
Round 2: 12
Round 3: 14
Round 4: 16
Round 5: 18
Round 6: 24
Round 7: 30
Round 8: 32
Round 9: 34
Round 10: 36
Round 11: 40
Round 12: 44
Round 13: 48
Round 14: 52
Round 15: 58
Round 16: 60
Round 17: 62

Hopefully i am right if not please correct me thanks!