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What is the algorithm for chaining? (Gen 4)?

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What is the algorithm for the increasing shiny chance in 4th gen?

Thank you.

(EDIT)
If there is a site with a calculator for this, it would be nice if someone could link me to it.

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> The formula for the probability of finding a Shiny Pokémon. Nc is the number of Pokémon in the chain, up to 40. The chances are calculated so that any shaking patch found in or after a chain of 40 has a 1 in 200 probability of being Shiny. ~ Bulbapedia

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Kthx :)
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You mean the real formula?

*Chance = (14747 - 40ChainNumber)/2621440(41-ChainNumber)** -Serebii

If you want to know how to do it, then read these links:
Smogon
Bulbapedia
Pokemon Wiki

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#getrekt