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1, 2, 3, 4, 7, 12, 23, 46, 97, 212, 481, 1124, 2705, 6682, 16919, 43840, 116087, 313764, 864683, 2427306, 6934769, 20148124, 59486997, 178364624, 542790609, 1675526482, 5243746235, 16630136364, 53422028679, 173754047228
(list; graph; refs; listen; history; internal format)
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