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1, 2, 6, 38, 220, 1276, 7394, 42928, 249820, 1457414, 8522374, 49944201, 293274590, 1725239500, 10165689720, 59988909903, 354481106586, 2097254798972, 12422219828212, 73653994432697, 437125592283006, 2596550320932708, 15436152237847644, 91834825523942367
(list;
graph;
refs;
listen;
history;
text;
internal format)
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