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1, 3, 13, 49, 201, 802, 3343, 14368, 62909, 282989, 1299074, 6111610, 29330177, 143869556, 719339872, 3669604633, 19062972671, 100880716332, 543086732800, 2974442015323, 16556687511535, 93655725178808, 537951557765438, 3137040309057826, 18560431188723607
(list;
graph;
refs;
listen;
history;
text;
internal format)
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