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1, 2, 11, 34, 195, 678, 3989, 14494, 86515, 321590, 1936881, 7301142, 44241261, 168359754, 1024642875, 3926147730, 23973456915, 92338836390, 565280386625, 2186194166950, 13411044301945, 52037098259090, 319756851757695, 1244063987615130, 7655279183309725, 29851422385561898
(list;
graph;
refs;
listen;
history;
text;
internal format)
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