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1, 2, 3, 14, 30, 143, 728, 3148, 13566, 56221, 231308, 939090, 3793530, 15237792, 61020524, 243678476, 971345694, 3866131073, 15371516800, 61064462784, 242432019936, 962016777729, 3816117832536, 15133756472226
(list; graph; refs; listen; history; internal format)
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