iztrans not giving correct result?

I wrote a program to first find out z transform X of input x and then secondly applied inverse z transform to X to get back original x but when i use the iztrans command , i do not get the original input as shown highlighted in attached phot. My code is as follow

 clc
 clear all
 close all
 syms z n
 x=n^2*heaviside(n)  % original input
 X=ztrans(x,z)       % z transform of input
 x1=iztrans(X,n)     % Application of inverse z transform to get back original input

Answer 1

[KALYAN ACHARJYA]

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