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1, 3, 73, 222, 5401, 16425, 399601, 1215228, 29565073, 89910447, 2187415801, 6652157850, 161839204201, 492169770453, 11973913695073, 36413910855672, 885907774231201, 2694137233549275, 65545201379413801
(list; graph; refs; listen; history; internal format)
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