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1, 1, 5, 17, 57, 193, 650, 2173, 7199, 23619, 76746, 247103, 788934, 2499707, 7866233, 24603551, 76538239, 236960031, 730506849, 2243545795, 6867375720, 20958167581, 63791696431, 193708118293, 586967142587, 1775245686845
(list;
graph;
refs;
listen;
history;
text;
internal format)
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