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1-4-16-52-196-X-n-




Question Number 134782 by oooooooo last updated on 07/Mar/21
1,4,16,52,196,...  X_n = ???
$$\mathrm{1},\mathrm{4},\mathrm{16},\mathrm{52},\mathrm{196},… \\ $$$$\mathrm{X}_{\mathrm{n}} =\:??? \\ $$

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