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1, 3, 9, 37, 189, 1138, 7970, 63763, 573871, 5738715, 63125866, 757510403, 9847635243, 137866893402, 2068003401034, 33088054416552, 562496925081397, 10124944651465158, 192373948377838002, 3847478967556760044
(list; graph; refs; listen; history; internal format)
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