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1, 4, 14, 50, 180, 658, 2429, 9052, 33975, 128320, 487124, 1857362, 7108400, 27293280, 105090130, 405643176, 1569193041, 6082113750, 23615073305, 91834287660, 357631419474, 1394521107804, 5444070076494, 21275915138100
(list;
graph;
refs;
listen;
history;
text;
internal format)
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