If (1+px+x^(2))^(n)=1+a(1)x+a(2)x^(2)+…+...

If `(1+px+x^(2))^(n)=1+a_(1)x+a_(2)x^(2)+…+a_(2n)x^(2n)`.
The value of `a_(1)+3a_(2)+5a_(3)+7a_(4)+….(4n-1)a_(2n)` when `p=-3` and `n in` even is

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