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1, 2, 3, 12, 25, 106, 376, 1670, 7315, 35808, 176971, 910940, 4782220, 25663080, 139884020, 773939566, 4334475055, 24546800088, 140363450663, 809676156506, 4707204024505, 27561115755712, 162415358799242, 962751492786378, 5737779091829582
(list;
graph;
refs;
listen;
history;
text;
internal format)
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