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1, 1, 2, 5, 17, 50, 166, 592, 2132, 7747, 29345, 113657, 439653, 1731991, 6959797, 28044519, 113767591, 467788415, 1936625448, 8035496503, 33615931265, 141684937750, 598464920684, 2538728461839, 10838186244657, 46414416433134, 199214751992087, 858994498480348, 3717461948696793
(列表;图表;参考;听;历史;文本;内部格式)
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