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2, 1, 1, 2, 4, 8, 18, 40, 88, 194, 460, 1080, 2514, 5840, 14256, 34450, 82552, 197696, 489714, 1204736, 2945128, 7188018, 18002376, 44805640, 110894770, 274209616, 691588200, 1736001314, 4338383356, 10827952192, 27470096770, 69388005832
(list;
graph;
refs;
listen;
history;
text;
internal format)
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