ff2n
              Two-level full factorial design.
 dFF2 = ff2n (n) gives factor settings dFF2 for a two-level
 full factorial design with n factors.  dFF2 is m-by-n, where m is the
 number of treatments in the full-factorial design.  Each row of dFF2
 corresponds to a single treatment.  Each column contains the settings for a
 single factor, with values of 0 and 1 for the two levels.
@seealso {fullfact
Source Code: ff2n