function Gn=ps14a_6242_2004(n)
% function Gn=ps14a_6242_2004(n)
%
% solves Problem 1.4(a) from 6.242/2004
n2=n^2;
A=toeplitz([-2*n2;n2;zeros(n-3,1)]);     
A(1,1)=-n2;
A(n-1,n-1)=-n2;
B=[n;zeros(n-2,1)];
C=[zeros(1,n-2) 1];
Gn=ss(A,B,C,0);