This looks pretty cool, while I'm not going to confirm or deny the validity of the values (I'm sure you could check them out). I will tell you it's not the algorithm we use to calculate the pricing even if the result may appear similar (I haven't checked myself so I actually don't know
), this is nicely recursive though.
Just to let you know, the first 10 chunks aren't actually 0 in their own right, they just happen to be free because you start off with 10 for free when you first join. (If you sell off your existing land and then go to try and buy some they won't be free
hopefully).
On a similar note, currently one individual chunk will never cost more than 200,000Nbz (excluding any extra fees).