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1, 3, 7, 23, 61, 207, 631, 2111, 6901, 23183, 77749, 263807, 896403, 3063147, 10493077, 36060927, 124198397, 428708475, 1482448439, 5134798223, 17811210781, 61864011135, 215127430973, 748898387039, 2609615501811, 9101687173595
(list;
graph;
refs;
listen;
history;
text;
internal format)
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