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0, 0, 2, 6, 36, 260, 2190, 21042, 226856, 2709576, 35491770, 505620830, 7780224012, 128555409996, 2269569526406, 42625044254730, 848404205856720, 17836074466842512, 394872870912995826, 9181542826326252726, 223680717959853460340, 5697036951307194432660, 151396442683371572351742
(列表;图表;参考;听;历史;文本;内部格式)
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