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A004395
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Ratios of successive terms are 1,1,2,3,3,4,5,5,6,7,7,...
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1
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1, 1, 1, 2, 6, 18, 72, 360, 1800, 10800, 75600, 529200, 4233600, 38102400, 342921600, 3429216000, 37721376000, 414935136000, 4979221632000, 64729881216000, 841488455808000, 11780838381312000, 176712575719680000
(list; graph; refs; listen; history; internal format)
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