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A066625
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Concatenation of factorials in increasing order up to the n-th and then in decreasing order.
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1, 121, 12621, 12624621, 1262412024621, 1262412072012024621, 12624120720504072012024621, 12624120720504040320504072012024621, 1262412072050404032036288040320504072012024621
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