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1, 3, 9, 63, 555, 6303, 87381, 1434891, 27272727, 589486923, 14288622513, 384034370151, 11338782475059, 364911575317383, 12716046006693165, 477070508584969299, 19174662804725408175, 822058028667720327891
(list;
graph;
refs;
listen;
history;
text;
internal format)
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