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1, 4, 14, 48, 151, 496, 1679, 4892, 16099, 55566, 126070, 437604, 1610354, 10586223, 37753710, 142615460, 545804530, 2501659594, 9822392246, 38387432220, 149904480000, 622664257407, 2483093527816, 9821396841402
(list;
graph;
refs;
listen;
history;
text;
internal format)
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