It is known that the sum of the first n terms of sequence {an} is sn = 2n 2+2n, and the sum of the first n terms of sequence {bn} is Tn=2-bn.

(i) Find the general formula of sequence {an} and {bn};

(II) let CN = (an) 2 * BN, and prove that C (n+ 1) < CN is if and only if n≥3.