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1, 1, 2, 5, 14, 39, 109, 308, 876, 2502, 7174, 20642, 59572, 172375, 499936, 1452939, 4230353, 12337274, 36033281, 105382550, 308574692, 904548474, 2654253082, 7795709736, 22916057914, 67416582519, 198477304237, 584722289762
(list;
graph;
refs;
listen;
history;
text;
internal format)
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