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1, 2, 4, 10, 20, 42, 84, 196, 392, 842, 1684, 3878, 7756, 16786, 33572, 76846, 153692, 333998, 667996, 1523448, 3046896, 6639150, 13278300, 30206468, 60412936, 131892226, 263784452, 598952096, 1197904192, 2619074230
(list; graph; refs; listen; history; internal format)
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