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1, 2, 6, 24, 120, 600, 3000, 15000, 75000, 350424, 1584462, 7107302, 32122831, 147587401, 683138716, 3168696388, 14688784152, 67987310592, 314281715520, 1451432697984, 6699167090880, 30914861411328, 142699378260288
(list;
graph;
refs;
listen;
history;
text;
internal format)
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