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1, 2, 4, 8, 19, 58, 209, 888, 4150, 21170, 115985, 678642, 4213609, 27644652, 190899368, 1382959444, 10480142163, 82864874064, 682076806177, 5832742226266, 51724158235802, 474869816272746, 4506715738447345
(list; graph; refs; listen; history; internal format)
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