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1, 0, 0, 0, 1, 1, 1, 1, 2, 3, 4, 5, 7, 10, 14, 18, 25, 35, 49, 66, 90, 124, 172, 236, 323, 443, 610, 839, 1152, 1581, 2173, 2987, 4104, 5636, 7743, 10640, 14620, 20084, 27591, 37908, 52085, 71559, 98311, 135067
(list; graph; refs; listen; history; internal format)
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