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0, 1, 9, 64, 425, 2751, 17640, 112848, 722601, 4638205, 29860259, 192831288, 1248973544, 8112024844, 52820112480, 344712308064, 2254247833257, 14768735480505, 96917273443305, 636948624057900, 4191706659276675
(list; graph; refs; listen; history; internal format)
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