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1, 1, 3, 9, 30, 106, 404, 1537, 6162, 24766, 102397, 426210, 1802081, 7664693, 33007543, 142705843, 622404766, 2725693390, 12012620447, 53129180250, 236136223997, 1052733359943, 4711947945784, 21146457395624, 95204483953282, 429645241238136, 1944091905593840, 8815083658503187, 40060085756852042
(列表;图表;参考;听;历史;文本;内部格式)
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