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1, 1, 3, 23, 132, 729, 3987, 18687, 82350, 342383, 1295579, 4634280, 15873501, 51143461, 156932559, 463212189, 1309275981, 3576241449, 9484669665, 24306269493, 60475548510, 146630200929, 345755185335, 796397380425, 1797676089003, 3970398558042, 8602390112508
(list;
graph;
refs;
listen;
history;
text;
internal format)
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