3,6,12,24,.....
We note that the constance term is r= 2
a1= 3
a2= 3*r = 3*2 = 6
A3= 3*r^2 = 3*2^2 = 3*4 = 12
a4 = 3*r^3 = 3*8 = 24
.....
a9= 3*r^8 = 3*2^8 = 3*256 = 768
an = 3^r^(n-1)= 3*2^(n-1)
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