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1, 12, 343, 3864, 26990, 140455, 599801, 2228414, 7486615, 23370193, 69141497, 196766283, 544680787, 1478898009, 3962865228, 10526310127, 27802386717, 73170829088, 192150938490, 503938185601, 1320621962194, 3459303317894, 9059231670566, 23721098636714
(list;
graph;
refs;
listen;
history;
text;
internal format)
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