To find the nth octagonal number in Swift, you can use the formula:

`main.swift14 chars2 lines`

Where `n`

is the index of the desired octagonal number.

Here's the implementation of the function that finds the nth octagonal number in Swift:

`main.swift335 chars9 lines`

Note that the index `n`

starts from 1, so the first octagonal number is at index 1, the second at index 2, and so on.

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