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0, 1, 2, 5, 12, 29, 70, 170, 410, 990, 2390, 5770, 13930, 33630, 81190, 196010, 473210, 1142430, 2758070, 6658570, 16075210, 38808990, 93693190, 226195370, 546083930, 1318363230, 3182810390, 7683984010, 18550778410, 44785540830, 108121860070
(list;
graph;
refs;
listen;
history;
text;
internal format)
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