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2, 6, 25, 98, 462, 1716, 7293, 27170, 111826, 487084, 1822366, 7696444, 30458900, 115000920, 455657715, 1873956510, 7649042610, 29135960700, 118406633730, 466052549820, 1786037492460, 7227122527560, 28473947932950
(list; graph; refs; listen; history; internal format)
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