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1, 3, 9, 30, 103, 373, 1358, 4969, 18392, 68622, 258379, 978416, 3719949, 14199019, 54381302, 208958223, 805138405, 3109441271, 12033378475, 46654135642, 181187474832, 704745881455, 2744947950635, 10704769093763
(list; graph; refs; listen; history; internal format)
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