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1, 3, 7, 16, 55, 235, 856, 2664, 9055, 37417, 151431, 533452, 1825972, 7141860, 29778280, 113688592, 400940751, 1499506693, 6185139781, 24862774872, 91529003839, 334939413067, 1338383383444, 5510330536000, 21217042841668, 77850045234108, 300471644949940
(列表;图表;参考;听;历史;文本;内部格式)
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