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2, 3, 6, 17, 50, 154, 490, 1608, 5402, 18475, 64130, 225346, 800046, 2865471, 10341168, 37567524, 137270954, 504174183, 1860277042, 6892326441, 25631327354, 95640861987, 357975249026, 1343650153462, 5056424257510, 19073789728773, 72108867616596
(list;
graph;
refs;
listen;
history;
text;
internal format)
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