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The phrase "then a" is correct and can be used in written English.
It is often used to introduce a thought or idea that is related to one stated previously. Example: He had heard stories of a legendary sword, then a thought occurred to him - what if he could find it?.
Exact(60)
Then a change occurred.
"Then a woodpecker".
And then a click.
Then, a relationship emerged.
Then a miracle happened.
Then, a realization hit.
And then a scream.
Then a riot began.
Then a week.
Then a smile.
And then, a writer.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com