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0, 0, 1, 4, 11, 33, 106, 350, 1194, 4189, 15071, 55427, 207981, 794847, 3089233, 12194591, 48836860, 198228772, 814795477, 3388909439, 14252884342, 60577219673, 260038762862, 1126860038414, 4927261126519, 21730146696444
(list; graph; refs; listen; history; internal format)
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