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

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

maths/series/catalan_numbers.py

@@ -10,6 +10,7 @@
 
 from __future__ import annotations
 
+
 def catalan_numbers(count: int) -> list[int]:
     """
     Generates the first 'count' Catalan numbers (C_0, C_1, ..., C_{count-1}).
@@ -72,4 +73,4 @@ def catalan_numbers(count: int) -> list[int]:
         else:
             print(f"The first {num} Catalan numbers are: {catalan_numbers(num)}")
     except ValueError:
-        print("Invalid input. Please enter an integer.")
+        print("Invalid input. Please enter an integer.")