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1, 0, 1, 4, 15, 40, 144, 512, 1841, 6528, 23808, 87380, 322875, 1198080, 4473647, 16777216, 63164175, 238605640, 904200192, 3435973836, 13089461538, 49977753600, 191219367936, 733007751680, 2814750270420, 10825959997440, 41699995927744, 160842843834660
(列表;图表;参考;听;历史;文本;内部格式)
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