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2, 7, 24, 68, 171, 398, 880, 1880, 3925, 8070, 16426, 33216, 66887, 134334, 269348, 539512, 1079993, 2161126, 4323582, 8648704, 17299179, 34600382, 69203064, 138408728, 276820381, 553644038, 1107291730, 2214587520
(list;
graph;
refs;
listen;
history;
text;
internal format)
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