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1, 0, 2, 3, 6, 30, 35, 210, 350, 1344, 3402, 9240, 29139, 72072, 231660, 603603, 1814670, 5095376, 14507324, 42401502, 118974466, 349305120, 990073812, 2877816304, 8272748675, 23852438880, 69116072950, 198980348385, 577566713520, 1667118322590, 4834810467135
(列表;图表;参考;听;历史;文本;内部格式)
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