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1, 1, 1, 1, 1, 1, 2, 6, 16, 36, 71, 127, 215, 367, 676, 1376, 2982, 6514, 13855, 28407, 56543, 111127, 219918, 444450, 919744, 1933732, 4082467, 8576027, 17861347, 36938427, 76207797, 157652981, 328119005, 687377565, 1446665765, 3050094661, 6427116181
(列表;图表;参考;听;历史;文本;内部格式)
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