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1, 1, 1, 2, 3, 6, 14, 31, 74, 176, 425, 1055, 2637, 6671, 16995, 43507, 112102, 290347, 755836, 1976717, 5189664, 13673314, 36139543, 95795807, 254610593, 678385919, 1811625931, 4848177910, 12999914523, 34921821516, 93971264941, 253272232362, 683646029385, 1847935127768, 5001703392561, 13554768152442, 36777239050602, 99896764310264, 271633640605450, 739353335433377, 2014350935223715, 5493039157088226, 14992221809540249
(列表;图表;参考;听;历史;文本;内部格式)
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