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1, 2, 4, 8, 16, 50, 280, 1640, 8320, 58850, 628000, 6283400, 51414400, 567708050, 8930646400, 126381905000, 1426497280000, 21409252621250, 444950339392000, 8140276707797000, 117131784689920000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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