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1, 2, 5, 15, 46, 146, 477, 1595, 5434, 18798, 65858, 233206, 833340, 3001316, 10883485, 39703635, 145612770, 536568150, 1985612310, 7376106210, 27495861060, 102820589820, 385609643250, 1449998633694, 5465731321476
(list;
graph;
refs;
listen;
history;
text;
internal format)
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