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1, 1, 1, 2, 4, 9, 20, 47, 112, 276, 684, 1713, 4295, 10797, 27103, 67985, 170202, 425420, 1061324, 2643451, 6573241, 16321357, 40469502, 100219208, 247888403, 612467226, 1511670488, 3727408256, 9182341969, 22600453960, 55579530018
(list;
graph;
refs;
listen;
history;
text;
internal format)
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