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1, 3, 4, 6, 10, 16, 26, 52, 108, 240, 574, 1566, 4542, 14998, 51080, 193986, 776946, 3396530, 15302498, 75908634, 384194222, 2104919470, 11853419616, 71548745928, 440446031112, 2912298313022, 19496636176860, 139215008197810, 1012273345561864, 7779962149588026
(list;
graph;
refs;
listen;
history;
text;
internal format)
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