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1, 4, 16, 60, 202, 626, 1787, 4755, 11848, 27881, 62265, 132769, 271431, 534358, 1016390, 1873983, 3358043, 5862811, 9993697, 16664380, 27227873, 43658180, 68789775, 106640700, 162829982, 245127960, 364155076, 534285064, 774774427
(list; graph; refs; listen; history; internal format)
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