def genseeds(n):
return binascii.hexlify(os.urandom(<NUM_LIT:4> * n))<EOL>
Return a random number generator seed for ensemble_simulations.
A seed for a single run is given by ``getseed(rngseed, i)``.

Parameters
----------
n : int
    A size of the seed.

Returns
-------
rndseed : bytes
    A random number seed for multiple runs.