'Generate a palette of colors or from the Greys palette.
The full Greys palette that serves as input for deriving new palettes
has 256 colors, and looks like:
:bokeh-palette:`grey(256)`
Args:
n (int) : size of the palette to generate
Returns:
list[str] : a list of hex RGB color strings
Raises:
``ValueError`` if n is greater than the base palette length of 256
Examples:
.. code-block:: python
>>> grey(6)
[\'#000000\', \'#333333\', \'#666666\', \'#999999\', \'#cccccc\', \'#ffffff\']
The resulting palette looks like: :bokeh-palette:`gray(6)`
.. note::
This function also has the alternate spelling ``gray``'

def grey(self, n):

    return self.linear_palette(self.Greys256, n)
