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1, 2, 5, 14, 56, 188, 639, 2206, 8485, 31278, 114960, 423612, 1621969, 6160764, 23359289, 88603820, 341015446, 1312635338, 5052259362, 19452272144, 75341562629, 292245458188, 1134351244952, 4405229026674, 17153557736343
(list;
graph;
refs;
listen;
history;
text;
internal format)
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