P0(x) -1 2 3 P 0(x)=(1+x) =1-x+x -x + 3 2- <1,1,1,1.. > G 0(x) G 0(x)=1- 2x+ 2x 2x + <1,2,2,2,…> 2 3 G 1(x) G 1(x)=1- 3x+5x - 7x + <1,3,5,7,…> G 2(x) 2 3 G 2(x)=1- 4x+ 9x -16x + <1,4,9,16,…> …………………..