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 Pochhammer

 http://functions.wolfram.com/06.10.03.0017.01

 Input Form

 Pochhammer[1/2, n] == (2 n - 1)!/(2^(2 n - 1) (n - 1)!)

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Pochhammer", "[", RowBox[List[FractionBox["1", "2"], ",", "n"]], "]"]], "\[Equal]", FractionBox[RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["2", "n"]], "-", "1"]], ")"]], "!"]], RowBox[List[SuperscriptBox["2", RowBox[List[RowBox[List["2", "n"]], "-", "1"]]], RowBox[List[RowBox[List["(", RowBox[List["n", "-", "1"]], ")"]], "!"]]]]]]]]]

 MathML Form

 ( 1 2 ) n TagBox[SubscriptBox[RowBox[List["(", FractionBox["1", "2"], ")"]], "n"], Pochhammer] ( 2 n - 1 ) ! 2 2 n - 1 ( n - 1 ) ! Pochhammer 1 2 n 2 n -1 2 2 n -1 n -1 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Pochhammer", "[", RowBox[List[FractionBox["1", "2"], ",", "n_"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["2", " ", "n"]], "-", "1"]], ")"]], "!"]], RowBox[List[SuperscriptBox["2", RowBox[List[RowBox[List["2", " ", "n"]], "-", "1"]]], " ", RowBox[List[RowBox[List["(", RowBox[List["n", "-", "1"]], ")"]], "!"]]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2001-10-29