对于n=2,x+y+z=u+v+w有20个有序解(x,y,z,u,v,w):(0,0,0,0,0,0,0),(0,0,1,0,0,1),(0,0,1,0,1,0),(0,0,1,0,0,0),(0,1,0,0,0,0,1),(0,1,0,0,1,0,0),(0,1,0,1,0,0,0),(0,1,1,0,1,1,1),(0,1,1,1,1,0,1),(1,0,0,0,0,0,0,1,0),1),(1,0,1,1,0,1),(1,0,1,1,1,0),(1,1,0,0,1,1),(1,1,0,1,0,1),(1,1,0,1,0,1), (1,1,0,1,1,0), (1,1,1,1,1,1).