а1=-16

а2=а1/2=-16/2=-8

а3=а2/2=-8/2=-4

а4=а3/2=--4/2=-2

а5=а4/2=-2/2=-1

а6=а5/2=-1/2=-0,5

Verified answer

a1=-16 an+1=an/2

a2=-16/2 a2=-8

a3=-8/2 a3=-4

a4=-4/2 a4=-2

a5=-2/2 a5=-1

a6=-1/2 a6=-0,5