S2=4a1+2
a2=5
S(n+1)=4an+2
S(n+2)=4a(n+1)+2
a(n+2)=4a(n+1)-4an
a(n+2)-2a(n+1)=2(a(n+1)-2an)
b(n+1)=2bn
b1=a2-2a1=3
得证