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A004527
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Ratios of successive terms are 1,2,2,3,4,4,5,6,6,...
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2
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1, 1, 2, 4, 12, 48, 192, 960, 5760, 34560, 241920, 1935360, 15482880, 139345920, 1393459200, 13934592000, 153280512000, 1839366144000, 22072393728000, 286941118464000, 4017175658496000, 56240459218944000
(list; graph; refs; listen; history; internal format)
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