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0, 0, 1, 1, 3, 5, 12, 27, 62, 149, 371, 952, 2513, 6807, 18873, 53472, 154554, 455076, 1363287, 4150560, 12829558, 40227005, 127843589, 411512640, 1340747909, 4418886387, 14724633149, 49582195801, 168638834537, 579103599979
(list; graph; refs; listen; history; internal format)
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