[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

maths/series/catalan_numbers.py

@@ -12,7 +12,6 @@
 import doctest
 
 
-
 def catalan_numbers(count: int) -> list[int]:
     """
     Generates the first 'count' Catalan numbers (C_0, C_1, ..., C_{count-1}).