(1)program sujet4

program sujet4;

uses wincrt;

var n:integer;

procedure saisie(var n:integer);

begin repeat

write('Donner un entier ');

readln(n);

until n in [3..20];

end;

procedure affiche;

var

i,u1,u2,un:integer;

begin u1:=1;

u2:=3;

write(u1,' ',u2,' ');

for i:=3 to n do begin

un:=2*u2+3*u1;

write(un,' ');

u1:=u2;

u2:=un;

end;

end;

begin saisie(n);

affiche;

end.