fullsimplify[functionexpand[(-1/4)^n/n! binom(n,k) factorialpower((3/7 i (2 k - n)), -1 + n)]]fullsimplify[functionexpand[(-1/4)^n/n! binom(n,k) factorialpower((3/7 i (2 k - n)), -1 + n)]]

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