{{alias}}( n )
    Computes the nth negaFibonacci number.

    The negaFibonacci numbers follow the recurrence relation

      F_{n-2} = F_{n} - F_{n-1}

    with seed values F_0 = 0 and F_{-1} = 1.

    If `|n|` is greater than `78`, the function returns `NaN` as larger
    negaFibonacci numbers cannot be accurately represented due to limitations of
    double-precision floating-point format.

    If not provided a non-positive integer value, the function returns `NaN`.

    If provided `NaN`, the function returns `NaN`.

    Parameters
    ----------
    n: integer
        Input value.

    Returns
    -------
    y: integer
        NegaFibonacci number.

    Examples
    --------
    > var y = {{alias}}( 0 )
    0
    > y = {{alias}}( -1 )
    1
    > y = {{alias}}( -2 )
    -1
    > y = {{alias}}( -3 )
    2
    > y = {{alias}}( -4 )
    -3
    > y = {{alias}}( -79 )
    NaN
    > y = {{alias}}( -80 )
    NaN
    > y = {{alias}}( NaN )
    NaN

    See Also
    --------