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1, 3, 8, 19, 51, 136, 361, 964, 2571, 6859, 18303, 48839, 130321, 347749, 927934, 2476099, 6607227, 17630735, 47045881, 125537307, 334983956, 893871739, 2385208823, 6364695154, 16983563041, 45318967620
(list; graph; refs; listen; history; internal format)
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