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1, 2, 6, 22, 90, 392, 1772, 8202, 38646, 185076, 900212, 4434356, 22009980, 109780044, 552560376, 2822976810, 14485344790, 72643772868, 361862583908, 2016493563604, 12216275226412, 46909968927072, -57894718593752, 1891831831407844, 70615065586770972
(列表;图表;参考;听;历史;文本;内部格式)
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