CatalanNumber[17/2] == 17179869184/(2078505 Pi)

Cell[BoxData[RowBox[List[RowBox[List["CatalanNumber", "[", FractionBox["17", "2"], "]"]], "\[Equal]", FractionBox["17179869184", RowBox[List["2078505", " ", "\[Pi]"]]]]]]]

<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[&quot;C&quot;, CatalanNumber] </annotation> </semantics> <mfrac> <mn> 17 </mn> <mn> 2 </mn> </mfrac> </msub> <mo> &#63449; </mo> <mfrac> <mn> 17179869184 </mn> <mrow> <mn> 2078505 </mn> <mo> &#8290; </mo> <mi> &#960; </mi> </mrow> </mfrac> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <ci> CatalanNumber </ci> <cn type='rational'> 17 <sep /> 2 </cn> </apply> <apply> <times /> <cn type='integer'> 17179869184 </cn> <apply> <power /> <apply> <times /> <cn type='integer'> 2078505 </cn> <pi /> </apply> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </annotation-xml> </semantics> </math>

Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["CatalanNumber", "[", FractionBox["17", "2"], "]"]], "]"]], "\[RuleDelayed]", FractionBox["17179869184", RowBox[List["2078505", " ", "\[Pi]"]]]]]]]

2007-05-02