How do Hestu's seed requirements scale?

Hestu's Korok seed scaling differs depending on which item slot you want to improve.

Here's how it goes if the image isn't clear:

All in all, you'll need 441 out of the 900 Korok Seeds to upgrade all of your stashes completely.

This image is from the official guide for the game and explains how many seeds are needed for each type of slot.

Weapon slots can be upgraded 11 times, bows slots can be 8 times, and shields 16 times.

To reiterate:

Weapons:

1. 1 seed
2. 2
3. 3
4. 5
5. 8
6. 12
7. 17
8. 25
9. 35
10. 45
11. 55

---

Bows:

1. 1 seed
2. 2
3. 3
4. 5
5. 8
6. 12
7. 17
8. 25

---

Shields:

1. 1 seed
2. 2
3. 3
4. 4
5. 5
6. 10
7. 10
8. 10
9. 10
10. 10
11. 15
12. 15
13. 15
14. 15
15. 15
16. 20