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Nov 17, 2019 at 19:19 comment added RobPratt Right, I didn't complete the computation for $a=3$ and instead gave a result for general $a$ in terms of the square of a finite sum of exponentials.
Nov 17, 2019 at 19:17 comment added Ivan Meir @RobPratt No but your answer was not a finite expression for the sum in question in terms of exponential functions which was the case for a=1 and a=2 in the OP's question.
Nov 17, 2019 at 19:05 comment added RobPratt "Actually the true...": Are you suggesting that something is untrue in my solution? I did a sanity check via WolframAlpha that your double sum matches my square of a sum for $a=3$..
Nov 17, 2019 at 18:38 history answered Ivan Meir CC BY-SA 4.0