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1, 0, 0, 1, 4, 10, 20, 175, 2296, 20244, 134520, 1016565, 13527580, 209970046, 2785823404, 33569936855, 467250784560, 8358652382760, 159820481883696, 2888819281378089, 51781860691882740, 1031576680142770930, 23237341150372569220, 543570375735294712651
(列表;图表;参考;听;历史;文本;内部格式)
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