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1, 3, 9, 21, 50, 132, 293, 660, 1506, 3245, 7076, 16106, 34583, 71142, 152060, 324278, 675302, 1376229, 2802336, 5785296, 11845829, 23776227, 46881076, 93000635, 184777349, 365374417, 715280116, 1384696572, 2662428956, 5123722227
(list;
graph;
refs;
listen;
history;
text;
internal format)
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