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1, 4, 16, 60, 228, 860, 3267, 12426, 47471, 181812, 698512, 2690086, 10384712, 40170182, 155681112, 604362074, 2349783665, 9148780570, 35665860725, 139202880860, 543887439194, 2127148912456, 8326877989146, 32623644335536
(list;
graph;
refs;
listen;
history;
text;
internal format)
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