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1, 4, 14, 57, 222, 928, 3764, 15971, 66190, 283464, 1190628, 5131002, 21749532, 94153056, 401757672, 1745117091, 7484144598, 32595240952, 140342565620, 612526487822, 2645723309284, 11567425911936, 50095161350616, 219340900447118
(list;
graph;
refs;
listen;
history;
text;
internal format)
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