Update CatalanNumbers.java

Author: UTSAVS26

src/main/java/com/thealgorithms/maths/CatalanNumbers.java

@@ -36,13 +36,4 @@ private static long factorial(final int n) {
         }
         return result;
     }
-
-    /**
-     * Main method to test the Catalan number calculation.
-     */
-    public static void main(String[] args) {
-        for (int i = 0; i <= 10; i++) {
-            System.out.println("Catalan number " + i + " is: " + catalan(i));
-        }
-    }
-}
+}