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1, 1, 3, 11, 44, 184, 800, 3544, 15950, 72666, 334276, 1549876, 7232910, 33939590, 160002964, 757355152, 3597467523, 17140996739, 81896369733, 392242556233, 1882772831063, 9055276934011, 43630125033845, 210563441647421
(list;
graph;
refs;
listen;
history;
text;
internal format)
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