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1, 4, 12, 36, 180, 1260, 7560, 25200, 277200, 1663200, 21621600, 64864800, 735134400, 6983776800, 146659312800, 1613252440800, 37104806138400, 445257673660800, 4452576736608000, 38588998383936000, 1080491954750208000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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