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   http://functions.wolfram.com/06.41.03.0024.01
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    CatalanNumber[-1] == -(1/2) 
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   Cell[BoxData[RowBox[List[RowBox[List["CatalanNumber", "[", RowBox[List["-", "1"]], "]"]], "\[Equal]", RowBox[List["-", FractionBox["1", "2"]]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <msub>  <semantics>  <mi> C </mi>  <annotation encoding='Mathematica'> TagBox["C", CatalanNumber] </annotation>  </semantics>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msub>  <mo>  </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> CatalanNumber </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["CatalanNumber", "[", RowBox[List["-", "1"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["-", FractionBox["1", "2"]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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