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1, 1, 2, 5, 12, 30, 76, 196, 518, 1422, 3915, 10813, 29964, 83304, 232323, 649845, 1822824, 5147328, 14727168, 42171849, 120870324, 346757334, 995742748, 2862099185, 8234447672, 23713180780, 68350541480, 197188167735
(list;
graph;
refs;
listen;
history;
text;
internal format)
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