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1, 3, 9, 28, 90, 311, 1099, 3928, 14151, 52025, 193192, 721507, 2704857, 10219356, 38814183, 147936398, 565229232, 2167575626, 8337587694, 32144302453, 124143606307, 480449680735, 1862906012700, 7234641087486, 28131953989641
(list;
graph;
refs;
listen;
history;
text;
internal format)
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