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 Fibonacci

 http://functions.wolfram.com/07.06.03.0004.01

 Input Form

 Fibonacci[n, -2 I] == (-(-I)^(n + 1)) n /; Element[n, Integers]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Fibonacci", "[", RowBox[List["n", ",", RowBox[List[RowBox[List["-", "2"]], " ", "\[ImaginaryI]"]]]], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "\[ImaginaryI]"]], ")"]], RowBox[List["n", "+", "1"]]]]], " ", "n"]]]], "/;", RowBox[List["n", "\[Element]", "Integers"]]]]]]

 MathML Form

 F TagBox["F", Fibonacci] n ( - 2 ) - ( - ) n + 1 n /; n TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] Condition Fibonacci n -2 -1 -1 n 1 n n [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Fibonacci", "[", RowBox[List["n_", ",", RowBox[List[RowBox[List["-", "2"]], " ", "\[ImaginaryI]"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[RowBox[List["-", SuperscriptBox[RowBox[List["(", RowBox[List["-", "\[ImaginaryI]"]], ")"]], RowBox[List["n", "+", "1"]]]]], " ", "n"]], "/;", RowBox[List["n", "\[Element]", "Integers"]]]]]]]]

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

 2001-10-29