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1, 2, 5, 15, 45, 141, 457, 1520, 5159, 17797, 62218, 219946, 784890, 2823666, 10229733, 37289210, 136665195, 503301525, 1861550310, 6912114330, 25755891510, 96279420870, 360961760250, 1356920443944, 5113523451462
(list;
graph;
refs;
listen;
history;
text;
internal format)
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