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Let {an}(n=0)^(oo) be a sequence such t...

Let `{a_n}_(n=0)^(oo)` be a sequence such that `a_0=a_1 = 0` and `a_(n+2)=2a_(n+1)-a_(n)+1` for all `nge0`. Then, `sum_(n=2)^(oo)(a_n)/(7^n)` is equal to :

A

`6/343`

B

`7/216`

C

`8/343`

D

`49/216`

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