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1, 1, 2, 5, 11, 27, 68, 175, 458, 1215, 3258, 8815, 24031, 65937, 181936, 504473, 1404879, 3927495, 11017802, 31004871, 87497297, 247559933, 702089528, 1995483853, 5682959332, 16214622573, 46343364290, 132667706857, 380358924209
(list;
graph;
refs;
listen;
history;
text;
internal format)
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