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1, 1, 1, 2, 3, 7, 18, 48, 133, 373, 1054, 3011, 8678, 25216, 73801, 217476, 644554, 1920718, 5750807, 17293653, 52208550, 158179651, 480806995, 1465841157, 4481166838, 13733815975, 42189399220, 129883408346
(list;
graph;
refs;
listen;
history;
text;
internal format)
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