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0, 1, 4, 23, 156, 1162, 9192, 75819, 644908, 5616182, 49826712, 448771622, 4092553752, 37714212564, 350658882768, 3285490743987, 30989950019532, 294031964658430, 2804331954047160, 26870823304476690, 258548658860327880, 2497104592420003980, 24199830095943069360, 235254163727798051070
(列表;图表;参考;听;历史;文本;内部格式)
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