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1, 3, 9, 28, 84, 246, 714, 2059, 5917, 16971, 48633, 139333, 399267, 1144669, 3283839, 9427981, 27090715, 77911897, 224272499, 646157234, 1863317958, 5377939756, 15535195892, 44913790501, 129955421387, 376313609029
(list;
graph;
refs;
listen;
history;
text;
internal format)
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