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1, 2, 4, 7, 13, 28, 72, 217, 741, 2790, 11388, 49875, 232781, 1151928, 6018800, 33087221, 190780229, 1150653938, 7241710948, 47454745823, 323154696205, 2282779990516, 16700904488728, 126356632390321, 987303454928997
(list;
graph;
refs;
listen;
history;
text;
internal format)
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