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 Factorial2

 http://functions.wolfram.com/06.02.16.0004.01

 Input Form

 (-n - 2)!! == (-(1/n!!)) (Pi/2)^Cos[(n Pi)/2]^2 Csc[(n Pi)/2]

 Standard Form

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

 MathML Form

 ( - n - 2 ) !! - 1 n !! ( π 2 ) cos 2 ( n π 2 ) csc ( n π 2 ) Factorial2 -1 n -2 -1 1 Factorial2 n -1 2 -1 n 2 -1 2 n 2 -1 [/itex]

 Rule Form

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

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

 2001-10-29