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1, 1, 2, 5, 14, 42, 132, 429, 1429, 4860, 16775, 58679, 207428, 739970, 2660157, 9627149, 35043221, 128207940, 471160868, 1738387703, 6436639288, 23908119163, 89056620547, 332583259981, 1244920744009, 4669782159158, 17550211110693, 66073189230521
(list;
graph;
refs;
listen;
history;
text;
internal format)
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