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1, 1, 6, 17, 68, 262, 898, 3415, 12665, 48273, 185597, 705894, 2710318, 10414884, 40204048, 155766007, 603806026, 2345327257, 9121945554, 35535598716, 138649731701, 541549508686, 2117490125861, 8287250061067, 32463187726182
(list;
graph;
refs;
listen;
history;
text;
internal format)
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