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1, 4, 9, 40, 2489, 9996, 22481, 99920, 6217521, 24970004, 56157529, 249600120, 15531364969, 62375059996, 140281484961, 623500999840, 38797343475041, 155812874900004, 350423093275049, 1557505248000200
(list; graph; refs; listen; history; internal format)
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