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1, 5, 19, 68, 250, 935, 3473, 12850, 48066, 181540, 686960, 2600830, 9893064, 37819055, 144917337, 556011134, 2138565128, 8248348136, 31873293528, 123320614254, 477883163716, 1855021589250, 7210702449848, 28058894828756
(list;
graph;
refs;
listen;
history;
text;
internal format)
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