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1, 2, 6, 21, 73, 261, 957, 3547, 13267, 50027, 189780, 723456, 2769333, 10637790, 40984228, 158306891, 612856611, 2377260192, 9237543329, 35951472496, 140116098727, 546778366195, 2136168391753, 8354417782742, 32705042089703
(list; graph; refs; listen; history; internal format)
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