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A129933
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(n*(n+1)/2+1)!/n!.
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1
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1, 2, 12, 840, 1663200, 174356582400, 1561112121913344000, 1754317855900734514790400000, 341362923889542287855059017400320000000, 15163751542692044063740921044974247390216192000000000, 195932150519417838363658963697014150610807423633478962380800000000000
(list; graph; refs; listen; history; internal format)
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