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Karena, 3,4 => 4-3 = 1 => 3+1= 4
4,6 => 6-4 = 2 => 4+2= 6
6,9 => 9-6 = 3 => 6+3 = 9
9,13 => 13-9 = 4 => 9+4= 13
13,18=> 18-13 = 5 => 13+5= 18
U1=>U2 b=2
U2=>U3 b=3
U3=>U4 b=4 jadi U3+4=9+4=13
U4=>U5 b=5 jadi U4+5=13+5=18
Jadi U4=13 dan U5=18