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0, 2, 8, 36, 181, 1000, 5985, 38416, 262144, 1889568, 14310835, 113379904, 936209559, 8031810176, 71397866601, 656100000000, 6219777023950, 60716992766464, 609359740010496, 6278211847988224, 66317769195774370, 717368321110468608, 7937902853812916501, 89762301673555234816, 1036371513660502339855
(list;
graph;
refs;
listen;
history;
text;
internal format)
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