Seed distribution varies based on how many seeds were planted the previous day. That number is multiplied by 1.10 and that is how many seeds are given out in a day. Your share of the distribution depends on how much MOTA you have staked. There is no real way to predict how many seeds are distributed daily because the number is never the same.
I am in the top 5 of staked MOTA and I get like 20-30 seeds a day- maybe more recently. Impossible for me to know exact numbers though as there are so many variables.
If you aren't adding MOTA to the pool regularly your share will likely decline as others enter the pool. My distribution seems to be slowly increasing each day. At least for now.