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1, 1, 3, 9, 31, 113, 431, 1699, 6869, 28337, 118827, 505077, 2171403, 9426025, 41260639, 181923359, 807230625, 3601980785, 16152883683, 72760511753, 329066924255, 1493649861729, 6802136334927, 31070513911731
(list;
graph;
refs;
listen;
history;
text;
internal format)
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