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1, 1, 2, 3, 5, 9, 18, 40, 98, 263, 769, 2439, 8357, 30808, 121677, 512654, 2294579, 10867855, 54272617, 284831748, 1566303877, 9000703543, 53917955406, 335961295910, 2173069940120, 14564444009958, 100977717043569
(list; graph; refs; listen; history; internal format)
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