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1, 2, 6, 20, 60, 210, 756, 2952, 11565, 46550, 187803, 763200, 3101683, 12627594, 51398640, 209268080, 851834453, 3467196936, 14109860408, 57413439000, 233584274238, 950220869136, 3865081177744, 15719992809672, 63930676119100
(list;
graph;
refs;
listen;
history;
text;
internal format)
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