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2014-09-19T18:02:42+02:00
U(1) = 4*U(0) = 4*2=8
U(2)=4*U(1)= 4*8=32
U(3)=4*U(2)=4*32=128
U(4)=4*U(3)=4*128=512

("*" signe de la multiplication)