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1, 4, 14, 53, 195, 711, 2662, 9973, 37367, 141472, 537422, 2045224, 7821958, 30001955, 115296650, 444336395, 1716137440, 6639137474, 25732460158, 99897347527, 388339939659, 1511670332538, 5891647475819, 22987227251180
(list;
graph;
refs;
listen;
history;
text;
internal format)
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