How do Hestu's seed requirements scale?

Every time you use Hestu to upgrade your space, it costs more seeds for the next upgrade.

I was keeping my upgrade levels equal across the board, just looking for the cheapest to upgrade, but I now think that all 3 scale at different paces.

So just to see if I'm hallucinating or not, how does Hestu scale for his upgrades?

Something like:

Swords

• Lvl 1 - 1 seed needed
• lvl 2 - 2
• lvl 3 - 4
• [...]

Solution 1:

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

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.

Solution 2:

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