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0, 1, 4, 18, 70, 273, 1026, 3876, 14520, 54477, 204248, 766935, 2882934, 10855425, 40939888, 154663938, 585260496, 2218309470, 8421352956, 32018897274, 121918083980, 464879984481, 1774996216144, 6785967883800
(list;
graph;
refs;
listen;
history;
text;
internal format)
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