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1, 4, 15, 56, 209, 784, 2958, 11220, 42753, 163548, 627770, 2416804, 9328384, 36087780, 139890764, 543246696, 2113015731, 8230687548, 32102370550, 125358442460, 490049744789, 1917595810240, 7510507532319, 29440544167696
(list;
graph;
refs;
listen;
history;
text;
internal format)
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