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A168572
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Sum(7^k,k=2..n)
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0
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0, 49, 392, 2793, 19600, 137249, 960792, 6725593, 47079200, 329554449, 2306881192, 16148168393, 113037178800, 791260251649, 5538821761592, 38771752331193, 271402266318400, 1899815864228849, 13298711049601992
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