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0, 1, 2, 12, 36, 156, 544, 2144, 7872, 30096, 112416, 425536, 1598528, 6031296, 22699008, 85552128, 322177024, 1213849856, 4572111360, 17224104960, 64880993280, 244410981376, 920685043712, 3468237545472, 13064787542016
(list;
graph;
refs;
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text;
internal format)
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