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2, 6, 14, 34, 82, 206, 526, 1378, 3674, 9950, 27278, 75514, 210634, 591054, 1666406, 4716186, 13389434, 38113462, 108737894, 310851770, 890244546, 2553782246, 7337143110, 21110531858, 60823037522, 175471424214, 506862346750, 1465875933394, 4244315841666, 12302751068958, 35699515448510, 103697897085458, 301514033677482, 877521633678990
(list;
graph;
refs;
listen;
history;
text;
internal format)
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