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1, 2, 4, 9, 19, 39, 82, 172, 361, 753, 1573, 3285, 6859, 14320, 29897, 62420, 130321, 272083, 568056, 1185986, 2476099, 5169593, 10793065, 22533736, 47045881, 98222278, 205068240, 428140987, 893871739
(list;
graph;
refs;
listen;
history;
text;
internal format)
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