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1, 2, 7, 19, 50, 135, 361, 963, 2570, 6859, 18302, 48838, 130321, 347748, 927933, 2476099, 6607226, 17630734, 47045881, 125537306, 334983955, 893871739, 2385208822, 6364695153, 16983563041, 45318967619
(list; graph; refs; listen; history; internal format)
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