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1, 3, 8, 22, 61, 173, 496, 1428, 4121, 11911, 34476, 99942, 290185, 843933, 2458296, 7171728, 20952569, 61295779, 179539052, 526476666, 1545434817, 4540842657, 13353733048, 39302395732, 115759913681, 341189589287
(list;
graph;
refs;
listen;
history;
text;
internal format)
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