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1, 1, 2, 7, 37, 127, 447, 1714, 6500, 25421, 97895, 375287, 1448601, 5602217, 21773586, 84709336, 329680204, 1284912153, 5013767813, 19593285139, 76653101618, 300131525916, 1176126277695, 4612440410377, 18102817952353
(list; graph; refs; listen; history; internal format)
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